ARM: dts: sun8i: a83t: Add pingroup for 8-bit eMMC on mmc2

mmc2 can support 8-bit eMMC chips, with a dedicated reset line.
Signed-off-by: NChen-Yu Tsai <wens@csie.org>
Acked-by: NMaxime Ripard <maxime.ripard@free-electrons.com>

arch/arm/boot/dts/sun8i-a83t.dtsi

@@ -271,6 +271,15 @@
 				bias-pull-up;
 			};
 
+			mmc2_8bit_emmc_pins: mmc2-8bit-emmc-pins {
+				pins = "PC5", "PC6", "PC8", "PC9",
+				       "PC10", "PC11", "PC12", "PC13",
+				       "PC14", "PC15", "PC16";
+				function = "mmc2";
+				drive-strength = <30>;
+				bias-pull-up;
+			};
+
 			spdif_tx_pin: spdif-tx-pin {
 				pins = "PE18";
 				function = "spdif";