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/gpio.c b/arch/arm/plat-samsung/gpio.c
index 5ff24e0..28d2ab8 100644
--- a/arch/arm/plat-samsung/gpio.c
+++ b/arch/arm/plat-samsung/gpio.c
@@ -16,7 +16,7 @@
 #include <linux/io.h>
 #include <linux/gpio.h>
 
-#include <mach/gpio-core.h>
+#include <plat/gpio-core.h>
 
 #ifdef CONFIG_S3C_GPIO_TRACK
 struct s3c_gpio_chip *s3c_gpios[S3C_GPIO_END];