arm64: dts: ti: k3-am62-main: Remove eMMC High Speed DDR support

For eMMC, High Speed DDR mode is not supported [0], so remove
mmc-ddr-1_8v flag which adds the capability.

[0] https://www.ti.com/lit/gpn/am625



Fixes: c37c58fd ("arm64: dts: ti: k3-am62: Add more peripheral nodes")
Cc: stable@vger.kernel.org
Signed-off-by: Judith Mendez <jm@ti.com>
Link: https://lore.kernel.org/r/20250707191250.3953990-1-jm@ti.com


Signed-off-by: Vignesh Raghavendra <vigneshr@ti.com>