AMD: Move RAMBASE and RAMTOP

There are no reasons to not load ramstage @ 0x100000.

Boards with HAVE_ACPI_RESUME enabled have performance penalty in using
excessive RAMTOP. For these boards, this change releases 11 MiB of RAM from CBMEM allocation to OS.

Change-Id: Ib71995aba5e9332d0ec1626b3eb3b4ef6a506d1c
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: http://review.coreboot.org/7094
Tested-by: build bot (Jenkins)
Reviewed-by: Edward O'Callaghan <eocallaghan@alterapraxis.com>

src/Kconfig

@@ -316,6 +316,11 @@ config TPM
 
 	  If unsure, say N.
 
+config RAMTOP
+	hex
+	default 0x200000
+	depends on ARCH_X86
+
 config HEAP_SIZE
 	hex
 	default 0x4000