input: sensor: improve apds993x suspend resume procedure

Apds993x driver drive both ambient light sensor and proximity
sensor, ambient light sensor should vote its regulators off when
processor enter suspend state, but proximity sensor is a wakeup
sensor it should stays on as long as it been enabled.

CRs-fixed: 670708
Change-Id: Ic00d17fc2b73b110851c3e894b5680ab46689369
Signed-off-by: Bingzhe Cai <bingzhec@codeaurora.org>