platform/chrome: cros_ec_commands: fix compile errors

Fix compile errors when including cros_ec_commands.h solely.

1.
cros_ec_commands.h:587:9: error: unknown type name 'uint8_t'
  587 |         uint8_t flags;
      |         ^~~~~~~

2.
cros_ec_commands.h:1105:43: error: implicit declaration of function 'BIT'
 1105 |         EC_COMMS_STATUS_PROCESSING      = BIT(0),
      |                                           ^~~

Reviewed-by: Guenter Roeck <groeck@chromium.org>
Signed-off-by: Tzung-Bi Shih <tzungbi@kernel.org>
Link: https://lore.kernel.org/r/20220609084957.3684698-2-tzungbi@kernel.org