arm64: dts: ti: k3-j7200-common-proc-board: Disable PPS for MCU CPSW CPTS

The commit fe572d57 ("arm64: dts: ti: k3-j7200-common-proc-board:
add mcu cpsw nuss pinmux and phy defs") has added PPS support for MCU
CPSW CPTS by routing GenF1 output to MCU_CPTS_HW4_PUSH input using
timesync interrupt router. The timesync router is modeled as a pinctrl
device with the interrupt output configured as a pinmux setting.
The TimeSync Interrupt Router module registers are firewalled from
SYSFW 2020.07-rc1 onwards, and this pinmux setting results in a data
abort and kernel boot failure.

Disable the PPS support and remove this pinmux setting to fix the kernel
boot. The required interrupt output setup needs to be done by System
Firmware through TI-SCI protocol.

Signed-off-by: Suman Anna <s-anna@ti.com>
Signed-off-by: Vignesh Raghavendra <vigneshr@ti.com>