ARM: dts: imx6q-ba16: Remove unused vqmmc-supply

The vqmmc supply is not connected to bio supply on the BA16 module.
Hence remove vqmmc-supply property in usdhc3 node.

Signed-off-by: Akshay Bhat <akshay.bhat@timesys.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>