arm64: dts: imx8mp-evk: correct mmc pad settings

According to RM bit layout, BIT3 and BIT0 are reserved.
  8  7   6   5   4   3  2 1  0
 PE HYS PUE ODE FSEL X  DSE  X

Not set reserved bit.

Fixes: 9e847693

 ("arm64: dts: freescale: Add i.MX8MP EVK board support")
Signed-off-by: Peng Fan <peng.fan@nxp.com>
Reviewed-by: Rasmus Villemoes <rasmus.villemoes@prevas.dk>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>