fastboot: power-up GPU when booting
fastboot: power-up GPU when booting

Power up GPU when booting. This is required for GPU kernel driver to
work properly. Otherwise, we saw kernel panic.

mali e82c0000.mali: Continuing without Mali clock control
Bad mode in Error handler detected, code 0xbf000002 -- SError
CPU: 7 PID: 1 Comm: swapper/0 Tainted: G        W       4.4.21+ #1
Hardware name: HiKey960 (DT)
task: ffffffc21a090000 ti: ffffffc21a07c000 task.ti: ffffffc21a07c000
PC is at kbase_reg_read+0x20/0x54
LR is at kbase_backend_gpuprops_get+0x24/0x1e4
pc : [<ffffffc0004f2b88>] lr : [<ffffffc0004f2e78>] pstate: 60000045
sp : ffffffc21a07fa30
x29: ffffffc21a07fa30 x28: ffffffc000c828a8

Signed-off-by: Guodong Xu <b3884af94c883a0fcbed2dca23baa11b986f7134@linaro.org>

96boards-hikey/tools-images-hikey960,96boards-hikey/tools-images-hikey960