platform/chrome: cros_ec_proto: Fix cros_ec_get_host_command_version_mask kdoc

Mark the documentation block as kernel doc and drop the documentation of
the non-existing parameter "@msg".

Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
Link: https://lore.kernel.org/r/20240524-cros_ec-cmd_versions-v1-2-8a148647d051@weissschuh.net


Signed-off-by: Tzung-Bi Shih <tzungbi@kernel.org>