arm64: dts: mediatek: mt8390-genio-common: Fix duplicated regulator name

usb_p2_vbus regulator has the same regulator-name property value as
sdio_fixed_3v3, so change it to avoid this.

Fixes: a4fd1943 ("arm64: dts: mediatek: mt8390-genio-700-evk: update regulator names")
Signed-off-by: Louis-Alexis Eyraud <louisalexis.eyraud@collabora.com>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Link: https://lore.kernel.org/r/20250221-fix-mtk8390-genio-common-dup-regulator-name-v1-1-92f7b9f7a414@collabora.com


Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>