Drop ARCH_ARM in favor of ARCH_ARMV7

The ARM architecture is really many architectures, and most
of them need their own toolchain. After discussing with Ron
and David, we decided that we're going to call the architecture
of our ARM board armv7.. This patch cleans out the remainders
of ARCH_ARM in the tree and moves on to consistent ARMv7 naming.
As of now, we only support little endian ARMv7 CPUs. We can
fix that for big endian if/when it comes our way.

Change-Id: Id70c7ef615f600e4d09961d811e7ac974fce4811
Signed-off-by: Stefan Reinauer <reinauer@google.com>
Reviewed-on: http://review.coreboot.org/1968
Tested-by: build bot (Jenkins)
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>

Makefile

@@ -113,14 +113,14 @@ else
 
 include $(HAVE_DOTCONFIG)
 
-ARCHDIR-$(CONFIG_ARCH_ARM)     := armv7
+ARCHDIR-$(CONFIG_ARCH_ARMV7)     := armv7
 ARCHDIR-$(CONFIG_ARCH_X86)     := x86
 
 ARCH-y := $(ARCHDIR-y)
 
 # If architecture folder name is different from GCC binutils architecture name,
 # override here.
-ARCH-$(CONFIG_ARCH_ARM)     := littlearm
+ARCH-$(CONFIG_ARCH_ARMV7)     := armv7
 ARCH-$(CONFIG_ARCH_X86)     := i386
 
 CC := $(CC_$(ARCH-y))

src/Kconfig

@@ -205,10 +205,6 @@ config ARCH_X86
 	default n
 	select PCI
 
-config ARCH_ARM
-	bool
-	default n
-
 config ARCH_ARMV7
 	bool
 	default n