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: Ye Li <ye.li@nxp.com> Signed-off-by: Jian Li <jian.li@nxp.com> Signed-off-by: Peng Fan <peng.fan@nxp.com>