platform: qpnp-revid: Add REVID support for PM2250

Add PMIC subtype and revid details for PM2250.
Remove subtype of PMI8937 as it is same as subtype
of PM2250 and is not used in this kernel version.

Change-Id: I64ad30101ab0e957bab52ac4dc6a464c1ab59739
Signed-off-by: Umang Chheda <uchheda@codeaurora.org>