mingetty: lower the ALTERNATIVE_PRIORITY

mingetty: lower the ALTERNATIVE_PRIORITY

mingetty doesn't work with serial consoles. Currently, it has the
same ALTERNATIVE_PRIORITY with busybox. So if it is installed with
busybox together, it's possible that the getty is linked to the
mingetty, causing failures when we login to the serial consoles.

Lower the its ALTERNATIVE_PRIORITY to solve this problem.

[YOCTO #4207]

(From OE-Core rev: 8cbae825c8a90874868bfe8cbf4e2b2f0d11b0de)

Signed-off-by: Chen Qi <Qi.Chen@windriver.com>
Signed-off-by: Saul Wold <sgw@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>