uboot-imx

MLK-22903 DTS: imx6sll_evk: Add startup delay for SD1/SD3 reset

For imx6sll EVK boards without eMMC soldered, the VDD_SD1 and VCC_WIFI
needs more than 1ms from 0V to 3V. Without any delay in startup, some
SD cards encounter initialization failed.
For boards with eMMC, the power ready time is less than 500us. It does
not meet such issue.

Also update the off-on-delay to 10ms according to the measured data.

Signed-off-by: Ye Li <ye.li@nxp.com>
Reviewed-by: Peng Fan <peng.fan@nxp.com>
(cherry picked from commit 21552e66a0bb37d8aa86066b33cc861fb3874071)