pinctrl: Fix the return value for devices without default state

Currently we're not returning a proper error value for the
devices which doesn't have default pinctrl state 0. This adds the
device to the pinctrl list and cause problems later. Fix this by
returning a proper error value when necessary.

Change-Id: Ia62a411376bddc446575f4c630ae185c6d584350
Signed-off-by: Subbaraman Narayanamurthy <subbaram@codeaurora.org>