regulator: qpnp-labibb: Update settings for AMOLED mode

As per the hardware documentation, update the following register
configurations in AMOLED mode.

    IBB_NONOVERLAP_TIME_1
    IBB_NONOVERLAP_TIME_2
    IBB_SPARE_CTL

This is to improve the IBB efficiency.

CRs-Fixed: 966167
Change-Id: I127a2b895bfce4afcdac1ad6aba051347d621cbe
Signed-off-by: Harry Yang <harryy@codeaurora.org>