arm64: dts: imx8mp-icore-mx8mp-edim2.2: correct pad settings

BIT3 and BIT0 are reserved bits, should not touch.

Fixes: aec8ad34 ("arm64: dts: imx8mp: Add Engicam i.Core MX8M Plus EDIMM2.2 Starter Kit")
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>