intel/mohonpeak: Change SEABIOS_MALLOC_UPPERMEMORY to config_seabios

Instead of the SEABIOS_MALLOC_UPPERMEMORY option, use a saved SeaBIOS
.config file to do the same thing.

Change-Id: I29110a382b7770329ef938876426e571fbbbb339
Signed-off-by: Martin Roth <martinroth@google.com>
Reviewed-on: https://review.coreboot.org/12569
Tested-by: build bot (Jenkins)
Reviewed-by: Alexander Couzens <lynxis@fe80.eu>
diff --git a/src/mainboard/intel/mohonpeak/config_seabios b/src/mainboard/intel/mohonpeak/config_seabios
new file mode 100644
index 0000000..f688f2b
--- /dev/null
+++ b/src/mainboard/intel/mohonpeak/config_seabios
@@ -0,0 +1,5 @@
+#  The Avoton/Rangeley chip does not allow devices to write into the 0xe000
+#  segment.  This means that USB/SATA devices will not work in SeaBIOS unless
+#  we put the SeaBIOS buffer area down in the 0x9000 segment.
+
+# CONFIG_MALLOC_UPPERMEMORY is not set