ArmPlatformPkg: move internal PL061 header into driver directory

Move the internal PL061 GPIO header file into the driver directory.
It shouldn't be referenced directly by other modules anyway.

Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Reviewed-by: Leif Lindholm <leif.lindholm@linaro.org>

ArmPlatformPkg/Drivers/PL061GpioDxe/PL061Gpio.c

@@ -27,7 +27,8 @@
 #include <Library/UefiRuntimeServicesTableLib.h>
 
 #include <Protocol/EmbeddedGpio.h>
-#include <Drivers/PL061Gpio.h>
+
+#include "PL061Gpio.h"
 
 PLATFORM_GPIO_CONTROLLER *mPL061PlatformGpio;