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/plat-s3c64xx/dma.c b/arch/arm/plat-s3c64xx/dma.c
index d554b93..0e0edf7 100644
--- a/arch/arm/plat-s3c64xx/dma.c
+++ b/arch/arm/plat-s3c64xx/dma.c
@@ -28,7 +28,7 @@
 #include <mach/irqs.h>
 
 #include <plat/dma-plat.h>
-#include <plat/regs-sys.h>
+#include <mach/regs-sys.h>
 
 #include <asm/hardware/pl080.h>