storm: define proper FMAP location

Flashmap offset needs to be defined through
configuration option. This definition must match
the FMAP location defined the appropriate device
tree in the deptcharge repository.

BUG=chrome-os-partner:32152
TEST=attempts to look up VPD in flash map do not
  fail anymore

Change-Id: I474f0c4854fc264bcae8eb27fbd43966a381aa91
Signed-off-by: Vadim Bendebury <vbendeb@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/219440
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
diff --git a/configs/config.storm b/configs/config.storm
index d744666..df94174 100644
--- a/configs/config.storm
+++ b/configs/config.storm
@@ -6,3 +6,4 @@
 CONFIG_CONSOLE_CBMEM=y
 CONFIG_USE_BLOBS=y
 CONFIG_CBFS_SIZE=0x002c0000
+CONFIG_FLASHMAP_OFFSET=0x00300000