Tegra: Change Tegra20 to Tegra in common code, prep for T30

Convert TEGRA20_ defines to either TEGRA_ or NV_PA_ where appropriate.
Convert tegra20_ source file and function names to tegra_, also.

Upcoming Tegra30 port will use common code/defines/names where possible.

Signed-off-by: Tom Warren <twarren@nvidia.com>
Acked-by: Stephen Warren <swarren@nvidia.com>
diff --git a/include/configs/whistler.h b/include/configs/whistler.h
index 3235718..6c565ba 100644
--- a/include/configs/whistler.h
+++ b/include/configs/whistler.h
@@ -34,12 +34,12 @@
 
 /* High-level configuration options */
 #define V_PROMPT		"Tegra20 (Whistler) # "
-#define CONFIG_TEGRA20_BOARD_STRING	"NVIDIA Whistler"
+#define CONFIG_TEGRA_BOARD_STRING	"NVIDIA Whistler"
 
 /* Board-specific serial config */
 #define CONFIG_SERIAL_MULTI
-#define CONFIG_TEGRA20_ENABLE_UARTA
-#define CONFIG_TEGRA20_UARTA_UAA_UAB
+#define CONFIG_TEGRA_ENABLE_UARTA
+#define CONFIG_TEGRA_UARTA_UAA_UAB
 #define CONFIG_SYS_NS16550_COM1		NV_PA_APB_UARTA_BASE
 
 #define CONFIG_MACH_TYPE		MACH_TYPE_WHISTLER
@@ -90,6 +90,6 @@
 #define CONFIG_CMD_NET
 #define CONFIG_CMD_DHCP
 
-#include "tegra20-common-post.h"
+#include "tegra-common-post.h"
 
 #endif /* __CONFIG_H */