arm64: dts: ti: k3-am69-sk: Fix UART pin type and macro type

arm64: dts: ti: k3-am69-sk: Fix UART pin type and macro type

Along fixing wkup UART RTS and TX pins as OUTPUT instead of INPUT
updating J784S4 macro for pin mux instead of J721S2.

Fixes: 45299dd1991b ("arm64: dts: ti: k3-am69-sk: Add mcu and wakeup uarts")
Fixes: 08ae12b63750 ("arm64: dts: ti: k3-am69-sk: Enable wakeup_i2c0 and eeprom")
Signed-off-by: Udit Kumar <u-kumar1@ti.com>
Reviewed-by: Francesco Dolcini <francesco.dolcini@toradex.com>
Link: https://lore.kernel.org/r/20240415095605.3547933-3-u-kumar1@ti.com
Signed-off-by: Nishanth Menon <nm@ti.com>