ARM: dts: Use 32KiHz oscillator on devkit8000

Devkit8000 board seems to always used 32k_counter as clocksource.
Restore this behavior.

If clocksource is back to 32k_counter, timer12 is now the clockevent
source (as before) and timer2 is not longer needed here.

This commit fixes the same issue observed with commit 23885389dbbb
("ARM: dts: Fix timer regression for beagleboard revision c") when sleep
is blocked until hitting keys over serial console.

Fixes: aba1ad05da08 ("clocksource/drivers/timer-ti-dm: Add clockevent and clocksource support")
Fixes: e428e250fde6 ("ARM: dts: Configure system timers for omap3")
Signed-off-by: Anthoine Bourgeois <[e-mail]>
Signed-off-by: Tony Lindgren <[e-mail]>

arch/arm/boot/dts/omap3-devkit8000-common.dtsi

···
 	status = "disabled";
 };
 
-/* Unusable as clocksource because of unreliable oscillator */
-&counter32k {
-	status = "disabled";
-};
-
 /* Unusable as clockevent because if unreliable oscillator, allow to idle */
 &timer1_target {
 	/delete-property/ti,no-reset-on-init;
···
 	};
 };
 
-/* Preferred always-on timer for clocksource */
+/* Preferred timer for clockevent */
 &timer12_target {
 	ti,no-reset-on-init;
 	ti,no-idle;
 	timer@0 {
 		/* Always clocked by secure_32k_fck */
-	};
-};
-
-/* Preferred timer for clockevent */
-&timer2_target {
-	ti,no-reset-on-init;
-	ti,no-idle;
-	timer@0 {
-		assigned-clocks = <&gpt2_fck>;
-		assigned-clock-parents = <&sys_ck>;
 	};
 };
 

drivers/clocksource/timer-ti-dm-systimer.c

···
 	bool quirk_unreliable_oscillator = false;
 
 	/* Quirk unreliable 32 KiHz oscillator with incomplete dts */
-	if (of_machine_is_compatible("ti,omap3-beagle-ab4") ||
-	    of_machine_is_compatible("timll,omap3-devkit8000")) {
+	if (of_machine_is_compatible("ti,omap3-beagle-ab4")) {
 		quirk_unreliable_oscillator = true;
 		counter_32k = -ENODEV;
 	}