ARM: dts: Unify pinctrl-single pin group nodes for omap2

We want to unify the pinctrl-single pin group nodes to use naming "pins".
Otherwise non-standad pin group names will add make dtbs checks errors
when the pinctrl-single yaml binding gets merged.

Cc: Conor Dooley <conor+dt@kernel.org>
Cc: Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>
Cc: Rob Herring <robh+dt@kernel.org>
Signed-off-by: Tony Lindgren <tony@atomide.com>

arch/arm/boot/dts/omap2420-n810.dts

@@ -23,7 +23,7 @@ v28_aic: v28_aic {
 };
 
 &omap2420_pmx {
-	mcbsp2_pins: mcbsp2_pins {
+	mcbsp2_pins: mcbsp2-pins {
 		pinctrl-single,pins = <
 			OMAP2420_CORE_IOPAD(0x0124, PIN_INPUT | MUX_MODE1)	/* eac_ac_sclk.mcbsp2_clkx */
 			OMAP2420_CORE_IOPAD(0x0125, PIN_INPUT | MUX_MODE1)	/* eac_ac_fs.mcbsp2_fsx */
@@ -32,7 +32,7 @@ OMAP2420_CORE_IOPAD(0x0127, PIN_OUTPUT | MUX_MODE1)	/* eac_ac_dout.mcbsp2_dx */
 		>;
 	};
 
-	aic33_pins: aic33_pins {
+	aic33_pins: aic33-pins {
 		pinctrl-single,pins = <
 			OMAP2420_CORE_IOPAD(0x0129, PIN_OUTPUT | MUX_MODE3)	/* eac_ac_rst.gpio118 */
 			OMAP2420_CORE_IOPAD(0x00e8, PIN_OUTPUT | MUX_MODE2)	/* vlynq_tx1.sys_clkout2 */