arm64: dts: ti: k3-am64: Enable TSCADC nodes at the board level

arm64: dts: ti: k3-am64: Enable TSCADC nodes at the board level

TSCADC nodes defined in the top-level AM64 SoC dtsi files are incomplete
and may not be functional unless they are extended with pinmux and/or
device information.

Disable the TSCADC nodes in the dtsi files and only enable the ones that
are actually pinned out on a given board.

Signed-off-by: Andrew Davis <afd@ti.com>
Reviewed-by: Dhruva Gole <d-gole@ti.com>
Link: https://lore.kernel.org/r/20230810003814.85450-14-afd@ti.com
Signed-off-by: Nishanth Menon <nm@ti.com>