ARM: dts: ti: align panel timings node name with dtschema

DT schema expects panel timings node to follow certain pattern,
dtbs_check warnings:

am335x-pdu001.dtb: display-timings: '240x320p16' does not match any of the regexes: '^timing', 'pinctrl-[0-9]+'

Linux drivers do not care about node name, so this should not have
effect on Linux.

Acked-by: Bartosz Golaszewski <[e-mail]> # For DaVinci
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Krzysztof Kozlowski <[e-mail]>

arch/arm/boot/dts/ti/davinci/da850-evm.dts

···
 
 		display-timings {
 			native-mode = <&timing0>;
-			timing0: 480x272 {
+			timing0: timing-480x272 {
 				clock-frequency = <9000000>;
 				hactive = <480>;
 				vactive = <272>;

arch/arm/boot/dts/ti/omap/am335x-guardian.dts

···
 		pinctrl-1 = <&lcd_pins_sleep>;
 
 		display-timings {
-			320x240 {
+			timing-320x240 {
 				hactive         = <320>;
 				vactive         = <240>;
 				hback-porch     = <68>;

arch/arm/boot/dts/ti/omap/am335x-pdu001.dts

···
 		};
 
 		display-timings {
-			240x320p16 {
+			timing-240x320p16 {
 				clock-frequency = <6500000>;
 				hactive = <240>;
 				vactive = <320>;

arch/arm/boot/dts/ti/omap/am335x-pepper.dts

···
 	};
 	display-timings {
 		native-mode = <&timing0>;
-		timing0: 480x272 {
+		timing0: timing-480x272 {
 			clock-frequency = <18400000>;
 			hactive = <480>;
 			vactive = <272>;