Tegra20: Move some include files to arch-tegra for sharing with Tegra30

The move is pretty straight-forward. ap20.h and tegra20.h were renamed to ap.h and tegra.h.
Some files remain in arch-tegra20 but 'include' a file in 'arch-tegra' with #defines & structs
that will be common between T20 and T30 HW. HW-specific #defines, etc. stay in the 'arch-tegra20'
'root' file.

All boards build OK w/MAKEALL -s tegra20. Checkpatch.pl runs clean. Seaboard works OK.

Signed-off-by: Tom Warren <twarren@nvidia.com>
diff --git a/drivers/gpio/tegra_gpio.c b/drivers/gpio/tegra_gpio.c
index 747f4cf..2417968 100644
--- a/drivers/gpio/tegra_gpio.c
+++ b/drivers/gpio/tegra_gpio.c
@@ -30,7 +30,7 @@
 #include <common.h>
 #include <asm/io.h>
 #include <asm/bitops.h>
-#include <asm/arch/tegra20.h>
+#include <asm/arch/tegra.h>
 #include <asm/gpio.h>
 
 enum {
diff --git a/drivers/i2c/tegra_i2c.c b/drivers/i2c/tegra_i2c.c
index e3be14e..efc77fa 100644
--- a/drivers/i2c/tegra_i2c.c
+++ b/drivers/i2c/tegra_i2c.c
@@ -26,12 +26,12 @@
 #include <fdtdec.h>
 #include <i2c.h>
 #include <asm/io.h>
-#include <asm/arch/clk_rst.h>
 #include <asm/arch/clock.h>
 #include <asm/arch/funcmux.h>
 #include <asm/arch/gpio.h>
 #include <asm/arch/pinmux.h>
-#include <asm/arch/tegra_i2c.h>
+#include <asm/arch-tegra/clk_rst.h>
+#include <asm/arch-tegra/tegra_i2c.h>
 
 DECLARE_GLOBAL_DATA_PTR;
 
diff --git a/drivers/input/tegra-kbc.c b/drivers/input/tegra-kbc.c
index 6f1cfd8..ab7a9e3 100644
--- a/drivers/input/tegra-kbc.c
+++ b/drivers/input/tegra-kbc.c
@@ -30,7 +30,7 @@
 #include <asm/io.h>
 #include <asm/arch/clock.h>
 #include <asm/arch/funcmux.h>
-#include <asm/arch/timer.h>
+#include <asm/arch-tegra/timer.h>
 #include <linux/input.h>
 
 DECLARE_GLOBAL_DATA_PTR;
diff --git a/drivers/mmc/tegra_mmc.c b/drivers/mmc/tegra_mmc.c
index ca8fad8..8fea6a6 100644
--- a/drivers/mmc/tegra_mmc.c
+++ b/drivers/mmc/tegra_mmc.c
@@ -20,12 +20,12 @@
  */
 
 #include <common.h>
-#include <mmc.h>
 #include <asm/gpio.h>
 #include <asm/io.h>
-#include <asm/arch/clk_rst.h>
 #include <asm/arch/clock.h>
-#include <asm/arch/tegra_mmc.h>
+#include <asm/arch-tegra/clk_rst.h>
+#include <asm/arch-tegra/tegra_mmc.h>
+#include <mmc.h>
 
 /* support 4 mmc hosts */
 struct mmc mmc_dev[4];
diff --git a/drivers/mtd/nand/tegra_nand.c b/drivers/mtd/nand/tegra_nand.c
index 8c1de34..2c1b533 100644
--- a/drivers/mtd/nand/tegra_nand.c
+++ b/drivers/mtd/nand/tegra_nand.c
@@ -26,12 +26,11 @@
 #include <common.h>
 #include <asm/io.h>
 #include <nand.h>
-#include <asm/arch/clk_rst.h>
 #include <asm/arch/clock.h>
 #include <asm/arch/funcmux.h>
-#include <asm/arch/gpio.h>
+#include <asm/arch-tegra/clk_rst.h>
 #include <asm/errno.h>
-#include <asm-generic/gpio.h>
+#include <asm/gpio.h>
 #include <fdtdec.h>
 #include "tegra_nand.h"
 
diff --git a/drivers/spi/tegra_spi.c b/drivers/spi/tegra_spi.c
index 18b00b2..9bb34e2 100644
--- a/drivers/spi/tegra_spi.c
+++ b/drivers/spi/tegra_spi.c
@@ -23,16 +23,15 @@
  */
 
 #include <common.h>
-
 #include <malloc.h>
-#include <spi.h>
 #include <asm/io.h>
 #include <asm/gpio.h>
-#include <asm/arch/clk_rst.h>
 #include <asm/arch/clock.h>
 #include <asm/arch/pinmux.h>
 #include <asm/arch/uart-spi-switch.h>
-#include <asm/arch/tegra_spi.h>
+#include <asm/arch-tegra/clk_rst.h>
+#include <asm/arch-tegra/tegra_spi.h>
+#include <spi.h>
 
 #if defined(CONFIG_SPI_CORRUPTS_UART)
  #define corrupt_delay()	udelay(CONFIG_SPI_CORRUPTS_UART_DLY);