arm64: dts: ti: k3-j721s2-common-proc-board: Add pinmux information for ADC

J721s2 has two instances of 8 channel ADCs in MCU domain. Add pinmux
information for both ADC nodes.

Signed-off-by: Bhavya Kapoor <b-kapoor@ti.com>
Reviewed-by: Vignesh Raghavendra <vigneshr@ti.com>
Link: https://lore.kernel.org/r/20230316095146.498999-3-b-kapoor@ti.com


Signed-off-by: Nishanth Menon <nm@ti.com>