arm64: dts: ti: k3-j721e-sk-rpi-hdr-ehrpwm: Set the updated pinmux for gpio0

commit 2d02cadf5b8bae31dbfee26f309e1b994e250b16 from
git://git.ti.com/ti-linux-kernel/ti-linux-kernel.git



Pinmux is updated for main_gpio0 in the overlay, but not set. Fix this
by setting the updated pinmux to main_gpio0

Signed-off-by: Rahul T R <r-ravikumar@ti.com>
Signed-off-by: Vignesh Raghavendra <vigneshr@ti.com>
Signed-off-by: Xulin Sun <xulin.sun@windriver.com>