ARM: dts: am335x-pocketbeagle: remove dependency cycle

ARM: dts: am335x-pocketbeagle: remove dependency cycle

Remove the self-referenceing "pinctrl-0" entry inside the pinmux clause.
This eliminates the set of boot messages (one for each referenced pin)
similar to the following:

platform 44e10800.pinmux: Fixed dependency cycle(s) with /ocp/interconnect@44c00000/segment@200000/target-module@10000/scm@0/pinmux@800/pinmux_P2_17_gpio

Signed-off-by: Trevor Woerner <twoerner@gmail.com>
Message-ID: <20230822143051.7640-3-twoerner@gmail.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>