imx8mp: Disables use of MR4 TUF flag (MR4[7]) bit
In uMCTL2 Databook, for LPDDR4, it is recommended to set this register to 1. This can avoid ddr bandwidth is lower after booting with running for a while. Reviewed-by: NYe Li <ye.li@nxp.com> Signed-off-by: NJian Li <jian.li@nxp.com> Signed-off-by: NPeng Fan <peng.fan@nxp.com>
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