[ARM] 3675/2: Preparing for AT91SAM926 support

Patch from Andrew Victor

This prepares the way for adding support for the new Atmel AT91SAM926x
processors.

Major changes:
- Rename time.c to at91rm9200_time.c
- Rename common.c to at91rm9200.c
- Introduce ARCH_AT91, of which ARCH_AT91RM9200, ARCH_AT91SAM9260 and
ARCH_AT91SAM9261 are dependent.

Signed-off-by: Andrew Victor <andrew@sanpeople.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index f123c7c..9716db0 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -121,11 +121,11 @@
 	help
 	  This enables support for ARM Ltd Versatile board.
 
-config ARCH_AT91RM9200
-	bool "Atmel AT91RM9200"
+config ARCH_AT91
+	bool "Atmel AT91"
 	help
-	  Say Y here if you intend to run this kernel on an Atmel
-	  AT91RM9200-based board.
+	  This enables support for systems based on the Atmel AT91RM9200
+	  and AT91SAM9xxx processors.
 
 config ARCH_CLPS7500
 	bool "Cirrus CL-PS7500FE"