mime.bbclass: remove the --disable-update-mimedb

mime.bbclass: remove the --disable-update-mimedb

Gnome and other freedesktop's mime data has been moved to
shared-mime-info, and there is no such an option any more, we already
have this recipe, so remove it, this will fix the warning:

configure was passed unrecognised options: --disable-update-mimedb

(From OE-Core rev: da2156ee0f1ddab499d9ca2968b82b411ea84a95)

Signed-off-by: Robert Yang <liezhi.yang@windriver.com>
Signed-off-by: Saul Wold <sgw@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>