nb/intel/pineview: Drop unused `GPIO32` macro

It's not used, and GPIO registers are on the southbridge.

Change-Id: I0b7b6edc22d461007f24618eca42091439a53d3c
Signed-off-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/45423
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/northbridge/intel/pineview/pineview.h

@@ -27,8 +27,6 @@
 #define GTTADR		0x1c
 #define BSM		0x5c
 
-#define GPIO32(x) *((volatile u32 *)(DEFAULT_GPIOBASE + x))
-
 /*
  * MCHBAR
  */