feat(imx8m): fix the ddr4 dvfs random hang on imx8m

Remove the while loop waiting in step12 to align with what
we did before, just use a 'if' condition check for debug
purpose.

Tested-by: Peng Fan <peng.fan@nxp.com>
Signed-off-by: Jacky Bai <ping.bai@nxp.com>
Change-Id: Id2685c5f628270a24944470d675a5c8706f39f13
1 file changed