plat: imx8mm: enable PU domains' clocks before power up

VPU, GPU and PCIE's clock need to be on before power on
these power domains.

Signed-off-by: Bai Ping <ping.bai@nxp.com>
(cherry picked from commit ee094d86280c0e3d899d973db24b4b9b563944da)
1 file changed