arm64: dts: imx95-19x19-evk: fix the overshoot issue of NETC

The overshoot of MDIO, MDC and ENET1_TDx is too high, so reduce the drive
strength these pins.

Fixes: 025cf789 ("arm64: dts: imx95-19x19-evk: add ENETC 0 support")
Signed-off-by: Wei Fang <wei.fang@nxp.com>
Reviewed-by: Frank Li <Frank.Li@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>