sysvinit: rc: exit psplash correctly

sysvinit: rc: exit psplash correctly

Previously, psplash didn't go away at system startup.
The root cause is that rc checks the file '/etc/init.d/xserver-nodm' to
determine whether to exit psplash manually. So even if xserver-nodm is not
linked into runlevel 3, psplash doesn't exit.

This patch fixes this problem by letting the rc script check the file
'/etc/rc${runlevel}.d/S??xserver-nodm' to determine whether to exit psplash
manually.

[YOCTO #3904]

(From OE-Core rev: 70b14f1c4181d820e56e67f4a5d921905094dc62)

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