mali-driver: add t7 support on r25p0 [1/1]

PD#SWPL-36458

Problem:
t7 gpu bringup

Solution:
add t7 support on r25p0
sync coding style with origin driver
mark pm-runtime-power-off which is no use for ic before T7

Verify:
ptm

Change-Id: I13b28c84e6013336cb353160e4a7a8f425dcc74e
Signed-off-by: Dezhi Kong <dezhi.kong@amlogic.com>