ARM: dts: msm: add PON regulator support for PMI8952/37 haptics

PON regulator can be enabled by the consumers whenever they
want to vote for the MBG to operate in normal power mode (NPM)
without which the MBG can enter low power mode (LPM) during PMIC
sleep (i.e. XO shutdown) causing performance degradation.
Haptics enables the regulator when the module is in use and then
disables it when it is done. Add support for that.

CRs-Fixed: 1003346
Change-Id: If7c6d56b9fe55edb32d8cc396d597af6e18a9847
Signed-off-by: Abinaya P <abinayap@codeaurora.org>