mb/google/poppy/variants/nami: Add EC_ENABLE_TBMC_DEVICE

Add tablet motion control config to nami devices.

BUG=None
BRANCH=None
TEST=run evtest
     make sure tablet switch value is 1 in tablet mode and 0
     when not in tablet mode

Change-Id: Ie1480934dc003d9b467883e001ed89f9a3694d10
Signed-off-by: Shelley Chen <shchen@google.com>
Reviewed-on: https://review.coreboot.org/26970
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Furquan Shaikh <furquan@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/mainboard/google/poppy/variants/nami/include/variant/ec.h

@@ -70,6 +70,7 @@
 
 /* Enable Tablet switch */
 #define EC_ENABLE_TABLET_EVENT
+#define EC_ENABLE_TBMC_DEVICE
 
 #define SIO_EC_MEMMAP_ENABLE	/* EC Memory Map Resources */
 #define SIO_EC_HOST_ENABLE	/* EC Host Interface Resources */