power: pm8921-charger: usb ovp trim for pm8921

This change adds the usb trim table for two
variants of PM8921. The correct PMIC is chosen
based on PM8921_USB_TRIM_SEL_BIT.

Change-Id: If0b832a2d571dff37fe5f7ea7e4b928aa60f9d03
Signed-off-by: David Keitel <dkeitel@codeaurora.org>