ARM: armada100: reduce dependence of including platform file

For files like the drivers/serial/serial.c, it must include the
platform file, as the CONFIG_SYS_NS16550_COM1 must reference to the
definition in the platform definition files.

Include the platform definition file in the config file, so that it
would decouple the dependence for the driver files.

Updated cpu.h to remove build errors for gplugd board (by prafulla)

Signed-off-by: Lei Wen <leiwen@marvell.com>
Signed-off-by: Prafulla Wadaskar <prafulla@marvell.com>
diff --git a/arch/arm/cpu/arm926ejs/armada100/cpu.c b/arch/arm/cpu/arm926ejs/armada100/cpu.c
index c21938e..14121a0 100644
--- a/arch/arm/cpu/arm926ejs/armada100/cpu.c
+++ b/arch/arm/cpu/arm926ejs/armada100/cpu.c
@@ -24,8 +24,8 @@
  */
 
 #include <common.h>
+#include <asm/arch/cpu.h>
 #include <asm/arch/armada100.h>
-#include <asm/io.h>
 
 #define UARTCLK14745KHZ	(APBC_APBCLK | APBC_FNCLK | APBC_FNCLKSEL(1))
 #define SET_MRVL_ID	(1<<8)
diff --git a/arch/arm/cpu/arm926ejs/armada100/dram.c b/arch/arm/cpu/arm926ejs/armada100/dram.c
index eacec23..8609004 100644
--- a/arch/arm/cpu/arm926ejs/armada100/dram.c
+++ b/arch/arm/cpu/arm926ejs/armada100/dram.c
@@ -24,6 +24,7 @@
  */
 
 #include <common.h>
+#include <asm/io.h>
 #include <asm/arch/armada100.h>
 
 DECLARE_GLOBAL_DATA_PTR;
diff --git a/arch/arm/cpu/arm926ejs/armada100/timer.c b/arch/arm/cpu/arm926ejs/armada100/timer.c
index 82a6d7b..fbade4b 100644
--- a/arch/arm/cpu/arm926ejs/armada100/timer.c
+++ b/arch/arm/cpu/arm926ejs/armada100/timer.c
@@ -24,6 +24,7 @@
  */
 
 #include <common.h>
+#include <asm/arch/cpu.h>
 #include <asm/arch/armada100.h>
 
 /*