Add 5420 to the set of recognizable platforms

It is used on peach_pit.

BRANCH=none
BUG=none
TEST=manual
   . on peach-pit:

  localhost ~ # echo $(crossystem arch)
  arm
  localhost ~ #

Change-Id: Ia9a4ea2291d6b672fca1c9e1305961eedc4f60cf
Signed-off-by: Vadim Bendebury <vbendeb@chromium.org>
Reviewed-on: https://gerrit.chromium.org/gerrit/59339
Reviewed-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Randall Spangler <rspangler@chromium.org>
1 file changed