dewatt: Enable CONFIG_TABLET_MODE_SWITCH
dewatt: Enable CONFIG_TABLET_MODE_SWITCH

Dewatt needs CONFIG_TABLET_MODE_SWITCH enabled for tablet switch
to be passed over MKBP.

BUG=b:228868883
TEST=Tablet mode works on dewatt
BRANCH=guybrush

Change-Id: I23ff1f0d7fec02ddfa9ea39c316d857bb754305c
Signed-off-by: Rob Barnes <3ced0940a2329ce70499686f01d3d60685ec66ed@google.com>
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/3589052
Reviewed-by: Robert Zieba <33e0ad3807fbfa18c105b3fe38a4090f81988052@google.com>

coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec