misc: tegra-baseband: remove PWR_DET WAR

misc: tegra-baseband: remove PWR_DET WAR

In http://git-master/r/#/c/487100/ we had a WAR to set voltage rail by
calling a function in powerdetect driver. Since we have pad control
driver for PMC now, we don't need to call this anymore, hence remove it
in modem power driver.

Bug 200059366

Change-Id: Ic183feee01987d479c243743d6838efad8893bb3
Signed-off-by: Mark Kuo <mkuo@nvidia.com>
Reviewed-on: http://git-master/r/655745
Reviewed-by: Automatic_Commit_Validation_User
Reviewed-by: Rajkumar Jayaraman <rjayaraman@nvidia.com>
Reviewed-by: Laxman Dewangan <ldewangan@nvidia.com>