arm64: dts: ti: k3-am62-lp-sk-nand: Rename pinctrls to fix schema warnings

arm64: dts: ti: k3-am62-lp-sk-nand: Rename pinctrls to fix schema warnings

[ Upstream commit cf5e8adebe77917a4cc95e43e461cdbd857591ce ]

Rename pinctrl nodes to comply with naming conventions required by
pinctrl-single schema.

Fixes: e569152274fec ("arm64: dts: ti: am62-lp-sk: Add overlay for NAND expansion card")
Signed-off-by: Wadim Egorov <w.egorov@phytec.de>
Link: https://patch.msgid.link/20251127122733.2523367-3-w.egorov@phytec.de
Signed-off-by: Nishanth Menon <nm@ti.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>