ARM: dts: sunxi: Change node name for pwrseq pin on Olinuxino-lime2-emmc

The node name for the power seq pin is mmc2@0 like the mmc2_pins_a one.
This makes the original node (mmc2_pins_a) scrapped out of the dtb and
result in a unusable eMMC if U-Boot didn't configured the pins to the
correct functions.
Signed-off-by: NEmmanuel Vadot <manu@bidouilliste.com>
Signed-off-by: NMaxime Ripard <maxime.ripard@free-electrons.com>

arch/arm/boot/dts/sun7i-a20-olinuxino-lime2-emmc.dts

@@ -56,7 +56,7 @@
 };
 
 &pio {
-	mmc2_pins_nrst: mmc2@0 {
+	mmc2_pins_nrst: mmc2-rst-pin {
 		allwinner,pins = "PC16";
 		allwinner,function = "gpio_out";
 		allwinner,drive = <SUN4I_PINCTRL_10_MA>;