power: smblite: Disable die-temp de-rating for FLASH on PM2250 v1.x

PM2250 v1.x has a ADC round-robin failure where charger die-temp
status gets stuck and may lead to flash de-rating. Avoid
this by disabling the charger die-temp de-rating.

This also requires creating a new schgm-flashlite interface.

Change-Id: I4a2199d5fb487bec087eda412103c9c45aa0a96e
Signed-off-by: Anirudh Ghayal <aghayal@codeaurora.org>