Can't set GPIO through DTB files?

I just change the nvidia,function in the generated pinmux.dtsi file from “rsvd1” to “gp”. Now, on bootup that pin has function uarta rather than unused according to jetson-io.
I used sudo cat /sys/kernel/debug/pinctrl/2430000.pinmux/pinconf-groupsto read the pin configuration details:

152 (uart1_cts_pr5): 
	pull=2
	tristate=1
	enable-input=1
	open-drain=0
	io-reset=0
	rcv-sel=0
	io-hv=0
	loopback=0
	schmitt=0
	pull-down-strength=0
	pull-up-strength=0
	drive-type=0
	func=uarta
	pad-power=0

So this pin still has function uarta even though I configured it as “gp” in the pinmux.dtsi file. I also disabled the other UARTA pins, and in the DTB we can under the system map address for UARTA (serial@3110000) its status is “disabled.”

Why is this still happening?