ARM: S3C64XX: Move headers into machine include directory

Move the register and GPIO definition files from plat-s3c64xx into the
machine include direcotry as they are unlikely to be reused outside
mach-s3c64xx.

This move includes removing the empty <mach/regs-clock.h> and replacing
it with the <plat/regs-clock.h> implementation.

Signed-off-by: Ben Dooks <ben-linux@fluff.org>
diff --git a/arch/arm/mach-s3c64xx/s3c6400.c b/arch/arm/mach-s3c64xx/s3c6400.c
index 884858a..2fba1b2 100644
--- a/arch/arm/mach-s3c64xx/s3c6400.c
+++ b/arch/arm/mach-s3c64xx/s3c6400.c
@@ -30,7 +30,7 @@
 
 #include <plat/cpu-freq.h>
 #include <plat/regs-serial.h>
-#include <plat/regs-clock.h>
+#include <mach/regs-clock.h>
 
 #include <plat/cpu.h>
 #include <plat/devs.h>