According to latest errata of J721e [1], (i2024) 'MMCSD: Peripherals
Do Not Support HS400' which applies to MMCSD0 subsystem. Speed modes
supported has been already updated but missed dropping 'ti,strobe-sel'
property which is only required by HS400 speed mode.

Thus, drop 'ti,strobe-sel' property from kernel dtsi for J721e SoC.

[1] https://www.ti.com/lit/er/sprz455/sprz455.pdf

Fixes: eb8f6194 ("arm64: dts: ti: k3-j721e-main: Update the speed modes supported and their itap delay values for MMCSD subsystems")
Signed-off-by: Bhavya Kapoor <b-kapoor@ti.com>
Signed-off-by: Nishanth Menon <nm@ti.com>
Reviewed-by: Diwakar Dhyani <d-dhyani@ti.com>
Reviewed-by: Nitin Yadav <n-yadav@ti.com>
Link: https://lore.kernel.org/r/20230203073724.29529-1-b-kapoor@ti.com