ARM: SAMSUNG: Remove empty gpio-core.h and use central plat/gpio-core.h

Rename mach-s3c2410/include/mach/gpio-core.h to mach/gpio-track.h so that
it can be included by <plat/gpio-core.h> when needed.

Eliminate all other empty gpio-core.h files and just include the
<plat/gpio-core.h> as necessary.

Signed-off-by: Ben Dooks <ben-linux@fluff.org>
diff --git a/arch/arm/plat-samsung/pm-gpio.c b/arch/arm/plat-samsung/pm-gpio.c
index cfd326a..69a4c7f 100644
--- a/arch/arm/plat-samsung/pm-gpio.c
+++ b/arch/arm/plat-samsung/pm-gpio.c
@@ -19,7 +19,7 @@
 #include <linux/io.h>
 #include <linux/gpio.h>
 
-#include <mach/gpio-core.h>
+#include <plat/gpio-core.h>
 #include <plat/pm.h>
 
 /* PM GPIO helpers */