msm: qpnp-power-on: modify logic to enable/disable S2 reset

Current design disables S2 reset if the reset configuration
parameters are not defined in DT. Add code change to disable
s2 reset only if the reset configuration is defined to disable
s2 reset.

Change-Id: I3addfaf44896decd5297048f19418d319ff60ad2
Signed-off-by: Abinaya P <abinayap@codeaurora.org>