mb/amd/mandolin: use more readable size formats in FMAP files

Since the FMD file isn't parsed any more by a shell script in the SoC's
Makefile.inc, we can use better human-readable numbers for the section
sizes.

TEST=Timeless build results in identical image.

Change-Id: I2117064a694f67767284f6fd4ac3604b254a2734
Signed-off-by: Felix Held <felix-coreboot@felixheld.de>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/48245
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Marshall Dawson <marshalldawson3rd@gmail.com>

src/mainboard/amd/mandolin/variants/cereme/board.fmd

@@ -1,8 +1,8 @@
 FLASH@0xFF000000 16M {
 	BIOS {
-		EC 0x20000
-		RW_MRC_CACHE 0x10000
-		FMAP 0x1000
+		EC 128K
+		RW_MRC_CACHE 64K
+		FMAP 4K
 		COREBOOT(CBFS)
 	}
 }

src/mainboard/amd/mandolin/variants/mandolin/board.fmd

@@ -1,8 +1,8 @@
 FLASH@0xFF800000 8M {
 	BIOS {
-		EC 0x20000
+		EC 128K
 		RW_MRC_CACHE 64K
-		FMAP 0x1000
+		FMAP 4K
 		COREBOOT(CBFS)
 	}
 }