common: Move older CPU functions to their own header

These should be moved to driver model, but in the meantime, move them
out of the common header to help reduce its size.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Tom Rini <trini@konsulko.com>
diff --git a/README b/README
index 1389e8f..107e67f 100644
--- a/README
+++ b/README
@@ -2983,7 +2983,7 @@
 - CONFIG_SYS_SRIOn_MEM_VIRT:
 		Virtual Address of SRIO port 'n' memory region
 
-- CONFIG_SYS_SRIOn_MEM_PHYS:
+- CONFIG_SYS_SRIOn_MEM_PHYxS:
 		Physical Address of SRIO port 'n' memory region
 
 - CONFIG_SYS_SRIOn_MEM_SIZE: