mainboard/google/reef: adjust chromeos.fmd regions

- Drastically reduced RW_MRC_CACHE size to hold one update. Now
  that this area isn't changing after every S5 entry there's no
  need make it so large.
- ELOG area reduced by 4KiB for subsequent area alignment. In practice
  this doesn't matter because the elog library only uses 4KiB bytes.
  16KiB->12KiB is a nop.
- Moved RW_NVRAM for subsequent alignment.
- Most importantly, RW_SECTION_(A|B) are aligned to 64KiB boundaries
  and sized to 64KiB multiples. This ensures updates don't need a
  read-modify-write that could force a system into recovery if
  an inopportune power event occurred.

BUG=chrome-os-partner:60492
BRANCH=reef

Change-Id: I2a2e2797897c934db1a3f9627c6c13a9b2aad540
Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: https://review.coreboot.org/17727
Tested-by: build bot (Jenkins)
Reviewed-by: Furquan Shaikh <furquan@google.com>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>

src/mainboard/google/reef/chromeos.fmd

@@ -12,32 +12,32 @@ FLASH 16M {
 			RO_UNUSED@0x1bc000 0x40000
 		}
 	}
-	MISC_RW@0x400000 0x4a000 {
-		UNIFIED_MRC_CACHE@0x0 0x40000 {
+	MISC_RW@0x400000 0x30000 {
+		UNIFIED_MRC_CACHE@0x0 0x21000 {
 			RECOVERY_MRC_CACHE@0x0 0x10000
-			RW_MRC_CACHE@0x10000 0x2f000
-			RW_VAR_MRC_CACHE@0x3f000 0x1000
+			RW_MRC_CACHE@0x10000 0x10000
+			RW_VAR_MRC_CACHE@0x20000 0x1000
 		}
-		RW_ELOG@0x40000 0x4000
-		RW_SHARED@0x44000 0x4000 {
+		RW_ELOG@0x21000 0x3000
+		RW_SHARED@0x24000 0x4000 {
 			SHARED_DATA@0x0 0x2000
 			VBLOCK_DEV@0x2000 0x2000
 		}
-		RW_VPD@0x48000 0x2000
+		RW_VPD@0x28000 0x2000
+		RW_NVRAM@0x2a000 0x6000
 	}
-	RW_SECTION_A@0x44a000 0x477800 {
+	RW_SECTION_A@0x430000 0x480000 {
 		VBLOCK_A@0x0 0x10000
-		FW_MAIN_A(CBFS)@0x10000 0x4677c0
-		RW_FWID_A@0x4777c0 0x40
+		FW_MAIN_A(CBFS)@0x10000 0x46ffc0
+		RW_FWID_A@0x47ffc0 0x40
 	}
-	RW_SECTION_B@0x8c1800 0x477800 {
+	RW_SECTION_B@0x8b0000 0x480000 {
 		VBLOCK_B@0x0 0x10000
-		FW_MAIN_B(CBFS)@0x10000 0x4677c0
-		RW_FWID_B@0x4777c0 0x40
+		FW_MAIN_B(CBFS)@0x10000 0x46ffc0
+		RW_FWID_B@0x47ffc0 0x40
 	}
-	RW_NVRAM@0xd39000 0x6000
-	RW_LEGACY(CBFS)@0xd3f000 0x200000
-	BIOS_UNUSABLE@0xf3f000 0x40000
+	RW_LEGACY(CBFS)@0xd30000 0x200000
+	BIOS_UNUSABLE@0xf30000 0x4f000
 	DEVICE_EXTENSION@0xf7f000 0x80000
 	# Currently, it is required that the BIOS region be a multiple of 8KiB.
 	# This is required so that the recovery mechanism can find SIGN_CSE