bmpblk/strongbad: Correct screen resolution

The screen resolution of coachz, which is the only model of strongbad
for now, should be 2160x1440. From AP console for developer boot:

 CBGFX: cbgfx initialized: screen:width=2160, height=1440

BUG=none
TEST=make BOARD=strongbad
BRANCH=none

Change-Id: I3335e1d0253a2b03600cca85325202552af1b6b2
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/bmpblk/+/2718557
Tested-by: Yu-Ping Wu <yupingso@chromium.org>
Reviewed-by: Julius Werner <jwerner@chromium.org>
Reviewed-by: Bob Moragues <moragues@chromium.org>
Commit-Queue: Bob Moragues <moragues@chromium.org>
1 file changed