platform/chrome: fix kernel-doc warnings for cros_ec_command

Fix the following kernel-doc warnings:

$ ./scripts/kernel-doc -none \
	include/linux/platform_data/cros_ec_commands.h
include/linux/platform_data/cros_ec_commands.h:1092: warning: expecting
prototype for struct ec_response_get_cmd_version. Prototype was for
struct ec_response_get_cmd_versions instead
include/linux/platform_data/cros_ec_commands.h:5485: warning: This
comment starts with '/**', but isn't a kernel-doc comment.
include/linux/platform_data/cros_ec_commands.h:5496: warning: This
comment starts with '/**', but isn't a kernel-doc comment.

Signed-off-by: Tzung-Bi Shih <tzungbi@kernel.org>
Reviewed-by: Guenter Roeck <groeck@chromium.org>
Link: https://lore.kernel.org/r/20230111055728.708990-5-tzungbi@kernel.org