i945: Remove GTT avoidance offset.

Not needed anymore with GTT at the end of range.

Change-Id: I57b02c7d605d3c43ac92bd744bb6472e3c3471e2
Signed-off-by: Vladimir Serbinenko <phcoder@gmail.com>
Reviewed-on: http://review.coreboot.org/6717
Tested-by: build bot (Jenkins)
Reviewed-by: Francis Rowe <info@gluglug.org.uk>
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>

src/northbridge/intel/i945/gma.c

@@ -104,8 +104,6 @@ static int intel_gma_init(struct northbridge_intel_i945_config *conf,
 	u32 uma_size;
 	u16 reg16;
 
-	pphysbase += 0x20000;
-
 	printk(BIOS_SPEW,
 	       "i915lightup: graphics %p mmio %08x addrport %04x physbase %08x\n",
 	       (void *)pgfx, pmmio, piobase, pphysbase);