[ARM] Arrange for platforms to select appropriate CPU support

Rather than:

	config CPU_BLAH
		bool
		depends on ARCH_FOO || MACH_BAR
		default y if ARCH_FOO || MACH_BAR

arrange for ARCH_FOO and MACH_BAR to select CPU_BLAH directly.

Acked-by: Nicolas Pitre <nico@marvell.com>
Acked-by: Andrew Victor <linux@maxim.org.za>
Acked-by: Brian Swetland <swetland@google.com>
Acked-by: Eric Miao <eric.miao@marvell.com>
Acked-by: Nicolas Bellido <ml@acolin.be>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
diff --git a/arch/arm/mach-pxa/Kconfig b/arch/arm/mach-pxa/Kconfig
index a062235..740f0a3 100644
--- a/arch/arm/mach-pxa/Kconfig
+++ b/arch/arm/mach-pxa/Kconfig
@@ -386,16 +386,19 @@
 
 config PXA25x
 	bool
+	select CPU_XSCALE
 	help
 	  Select code specific to PXA21x/25x/26x variants
 
 config PXA27x
 	bool
+	select CPU_XSCALE
 	help
 	  Select code specific to PXA27x variants
 
 config PXA3xx
 	bool
+	select CPU_XSC3
 	help
 	  Select code specific to PXA3xx variants