davinci: add arch_ioremap() which uses existing static mappings

Add arch-specific ioremap() which uses any existing static mappings in
place of doing a new mapping.  From now on, drivers should always use
ioremap() instead of IO_ADDRESS().

In addition, remove the davinci_[read|write]* macros in favor of using
ioremap.

Signed-off-by: Kevin Hilman <khilman@deeprootsystems.com>
diff --git a/arch/arm/mach-davinci/psc.c b/arch/arm/mach-davinci/psc.c
index c509883..e44544a 100644
--- a/arch/arm/mach-davinci/psc.c
+++ b/arch/arm/mach-davinci/psc.c
@@ -28,6 +28,8 @@
 #include <mach/psc.h>
 #include <mach/mux.h>
 
+#define DAVINCI_PWR_SLEEP_CNTRL_BASE 0x01C41000
+
 /* PSC register offsets */
 #define EPCPR		0x070
 #define PTCMD		0x120