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/Kconfig b/arch/arm/Kconfig
index f18f8b8..2d93211 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -698,6 +698,7 @@
 	select ARCH_MAY_HAVE_PC_FDC
 	select ARCH_SPARSEMEM_ENABLE
 	select ARCH_USES_GETTIMEOFFSET
+	select CPU_SA110
 	select FIQ
 	select HAVE_IDE
 	select HAVE_PATA_PLATFORM