imx8mp: DDR performance tunning

1. set SCHED.rdwr_idle_gap=0
2. set SCHED.pageclose=1

Reviewed-by: Jacky Bai <ping.bai@nxp.com>
Signed-off-by: Jian Li <jian.li@nxp.com>
Signed-off-by: Peng Fan <peng.fan@nxp.com>
1 file changed