tests: counter: Remove timer2 node from testing

By default, timer2 node is reserved for the OS tick generation and thus,
it should not be referenced by application.

Signed-off-by: Ioannis Karachalios <[email protected]>

Author: ioannis-karachalios

tests/drivers/counter/counter_basic_api/boards/da1469x_dk_pro.overlay

@@ -4,11 +4,7 @@
 	status = "okay";
 };
 
-&timer2 {
-	clock-src = <&divn_clk>;
-	prescaler = <1>;
-	status = "okay";
-};
+/* timer2 is used as low-power clock source, reserved for the OS tick generation */
 
 &timer3 {
 	clock-src = <&lp_clk>;