soc: qcom: Check rmb status register for spss bootup status

uefi bootloader may not bring out the spss for all the
scenarios such as fastboot continue when device is flashed
first time. uefi sets rmb general purpose status register
when it failed to bring spss out of reset. So secure
pil driver checks the rmb general purpose register to find out
whether spss firmware is already loaded or not and updates the
.powerup function.

Change-Id: Iade37d6e0a8354b4178e2a4c1b36e90f024aeb84
Signed-off-by: Prasad Sodagudi <psodagud@codeaurora.org>