ARM: rpc: autoselect CPU_SA110

ARCH_RPC no longer supports other CPUs aside from StrongARM110,
so we can make the option implicitly selected by the platform
and no longer give the option of building a kernel without CPU
support.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Cc: Russell King <linux@arm.linux.org.uk>
diff --git a/arch/arm/mm/Kconfig b/arch/arm/mm/Kconfig
index 1f8fed9..9e83229 100644
--- a/arch/arm/mm/Kconfig
+++ b/arch/arm/mm/Kconfig
@@ -264,7 +264,7 @@
 
 # SA110
 config CPU_SA110
-	bool "Support StrongARM(R) SA-110 processor" if ARCH_RPC
+	bool
 	select CPU_32v3 if ARCH_RPC
 	select CPU_32v4 if !ARCH_RPC
 	select CPU_ABRT_EV4