The input pins are sometimes not initialized properly because
of the optimization check of the current pinctl code.

Force to initialize the mic input pins so that they can be set up
properly even if they were in a weird state.  But keep other input
pins if already set up as input, since this could be an extra mic
pin.

Reference: Novell bnc#443738
	https://bugzilla.novell.com/show_bug.cgi?id=443738Signed-off-by: Takashi Iwai <tiwai@suse.de>