init-install.sh: remove unnecessary udev rules file to avoid error messages

init-install.sh: remove unnecessary udev rules file to avoid error messages

/etc/udev/scripts/mount.sh is removed by init-install.sh, but the udev
rules file which specifies the invocation of this script is not removed,
thus causing the error message '/etc/udev/scripts/mount.sh: No such file
or directory' shown at a live install.

The /etc/udev/rules/automount.rules no longer works once the mount.sh script
is removed. So we remove it to avoid the error message.

[YOCTO #3924]

(From OE-Core rev: 6b6db7b4fb7aa17b8e29076decc830149b9d35bc)

Signed-off-by: Chen Qi <Qi.Chen@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>