On i.MX8MM, thinking such as clk path
OSC->PLL->PLL GATE->CCM ROOT->CCGR GATE->Device

Only enabling CCGR GATE is not enough, we also need to enable PLL GATE
to make sure the clk path work. So when enabling CCGR GATE,
we could prograte to enabling PLL GATE to make life easier.
Signed-off-by: NPeng Fan <peng.fan@nxp.com>