staging: typec: fusb302: make structure fusb302_psy_desc static

The const structure fusb302_psy_desc is local to the source and
does not need to be in global scope, so make it static.

Cleans up sparse warnings
symbol 'fusb302_psy_desc' was not declared. Should it be static?

Signed-off-by: Colin Ian King <colin.king@canonical.com>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>