msm: qpnp-power-on: Configure debounce delay for PON GEN2 properly

Debounce delay range and hence the bit encodings got changed in
PON GEN2 peripheral. Fix qpnp_pon_set_dbc() to configure the
debounce delay properly.

CRs-Fixed: 1097089
Change-Id: Ia3d474a04e11c7d16a1507d65e99001cf844947b
Signed-off-by: Subbaraman Narayanamurthy <subbaram@codeaurora.org>