gimble: Implement board_is_dts_port
gimble: Implement board_is_dts_port

BUG=none
BRANCH=none
TEST=make -j BOARD=gimble

Signed-off-by: Scott Chao <8cefa9751fac9aaa897ba1213763a96ba8dbd20d@wistron.corp-partner.google.com>
Change-Id: I445701602e1d59e15cd738cb64ca7b4c7ba732f7
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/3026703
Reviewed-by: caveh jalali <08e24a66aefda7a55ca7d73f8903e0fb16eec763@chromium.org>
Reviewed-by: Boris Mittelberg <46897f4fb5cad4b1d5146ad1fd460d7f4825bbf7@google.com>
Commit-Queue: Boris Mittelberg <46897f4fb5cad4b1d5146ad1fd460d7f4825bbf7@google.com>

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