MLK-18243-12 arm: imx8m: add cpu revision for i.MX8MM

Add cpu revision for i.MX8MM
Add helper function

Change-Id: I6580ce4f3c6bb52e1b9fec6312347cc6d6195dc6
Signed-off-by: Peng Fan <peng.fan@nxp.com>
1 file changed