arm64: dts: renesas: sparrow-hawk: Fix full-size DP connector node name and labels

arm64: dts: renesas: sparrow-hawk: Fix full-size DP connector node name and labels

The DisplayPort connector on Retronix R-Car V4H Sparrow Hawk board
is a full-size DisplayPort connector. Fix the copy-paste error and
update the DT node name and labels accordingly. No functional change.

Fixes: a719915e76f2 ("arm64: dts: renesas: r8a779g3: Add Retronix R-Car V4H Sparrow Hawk board support")
Signed-off-by: Marek Vasut <marek.vasut+renesas@mailbox.org>
Reviewed-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://patch.msgid.link/20251027184604.34550-1-marek.vasut+renesas@mailbox.org
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>