[ARM] pxa: separate out power manager and clock registers

The power manager and core clock registers aren't present in PXA3
CPUs.  Move them out of pxa-regs.h into pxa2xx-regs.h, and include
pxa2xx-regs.h where necessary.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
diff --git a/include/asm-arm/arch-pxa/system.h b/include/asm-arm/arch-pxa/system.h
index 9aa6c2e..ba7e132 100644
--- a/include/asm-arm/arch-pxa/system.h
+++ b/include/asm-arm/arch-pxa/system.h
@@ -12,6 +12,7 @@
 
 #include <asm/proc-fns.h>
 #include "hardware.h"
+#include "pxa2xx-regs.h"
 #include "pxa-regs.h"
 
 static inline void arch_idle(void)