nehalem: Remove SSKPD.

Not really used and conflicts with SSKPD from i915_regs.h

Change-Id: I1462457f656310df99e78aee8cbfe0206f6e2a1e
Signed-off-by: Vladimir Serbinenko <phcoder@gmail.com>
Reviewed-on: http://review.coreboot.org/5268
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>

src/northbridge/intel/nehalem/nehalem.h

@@ -504,7 +504,6 @@ void init_iommu(void);
 #define MCHBAR32(x) *((volatile u32 *)(DEFAULT_MCHBAR + x))
 #define MCHBAR32_OR(x, or) MCHBAR32(x) = (MCHBAR32(x) | (or))
 
-#define SSKPD		0x5d14	/* 16bit (scratchpad) */
 #define BIOS_RESET_CPL	0x5da8	/* 8bit */
 
 /*