msm: qpnp-power-on: Support PON major revision 1 reset sequence

With PON major revision 1, there is now a new register at offset
0x5B that is responsible for enabling the reset enable. Support
this new major revision spec while maintaining compatability for
revision 0.

CRs-Fixed: 481677
Change-Id: I10793ca48236c04a25c2f05572f94de2d02ee621
Signed-off-by: Michael Bohan <mbohan@codeaurora.org>