intel fsp: remove CHIPSET_RESERVED_MEM_BYTES

FSP 1.1 platforms should be conforming to the spec. In order
to ensure following specification remove the crutch that allows
FSP to no conform.

BUG=chrome-os-partner:41961
BRANCH=None
TEST=Built.

Change-Id: I28b876773a3b6f07223d60a5133129d8f2c75bf6
Signed-off-by: Patrick Georgi <pgeorgi@chromium.org>
Original-Commit-Id: c3fe08c5af41867782e422f27b0aed1b762ff34a
Original-Change-Id: Ib97027a35cdb914aca1eec0eeb225a55f51a4b4b
Original-Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Original-Reviewed-on: https://chromium-review.googlesource.com/285187
Original-Reviewed-by: Leroy P Leahy <leroy.p.leahy@intel.com>
Original-Reviewed-by: Duncan Laurie <dlaurie@chromium.org>
Reviewed-on: http://review.coreboot.org/10993
Tested-by: build bot (Jenkins)
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>

src/soc/intel/skylake/memmap.c

@@ -96,6 +96,6 @@ void *cbmem_top(void)
 		top_of_ram = ALIGN_DOWN(top_of_ram, mmap_region_granluarity());
 	}
 
-	return (void *)(top_of_ram - CONFIG_CHIPSET_RESERVED_MEM_BYTES);
+	return (void *)top_of_ram;
 }