Fingerprint: fix potential null pointer dereference issue

The pointer of two-dimensional array which may cause some
null pointer dereference. eg..fpc1020->pinctrl_state[1] is
not initialized by default, although fpc1020->pinctrl_state
is initialized by default. Use one dimensional array pointer
to fix the issue.

Change-Id: Ib36abe2ec60c1e5d5636471bec6c11f482313814
Signed-off-by: Can Guo <cang@codeaurora.org>