haswell: Update GT PM register value

This was changed to 0x80000000 in SA BWG 1.5.0.

Change-Id: Ic6773f45057f3eb93b2d93ee543e3db77fccf805
Signed-off-by: Duncan Laurie <dlaurie@chromium.org>
Reviewed-on: https://gerrit.chromium.org/gerrit/50852
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: http://review.coreboot.org/4166
Tested-by: build bot (Jenkins)
Reviewed-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>
1 file changed