boards: frdm_mcxc444: Add counters support

mcxc444 also has pit and rtc counters, add the counters to
board documentation, and enable it explicitly in board dts.
Set rtc clock to 32 kHz oscillator.

Signed-off-by: Neil Chen <[email protected]>

Author: NeilChen93

boards/nxp/frdm_mcxc444/doc/index.rst

@@ -57,6 +57,10 @@ The ``frdm_mcxc444`` board target supports the following hardware features:
 +-----------+------------+-------------------------------------+
 | LPTMR     | on-chip    | counter                             |
 +-----------+------------+-------------------------------------+
+| PIT       | on-chip    | counter                             |
++-----------+------------+-------------------------------------+
+| RTC       | on-chip    | counter                             |
++-----------+------------+-------------------------------------+
 
 
 Targets available

boards/nxp/frdm_mcxc444/frdm_mcxc444.dts

@@ -62,7 +62,7 @@
 
 &sim {
 	pllfll-select = <KINETIS_SIM_PLLFLLSEL_MCGPLLCLK>;
-	er32k-select = <KINETIS_SIM_ER32KSEL_LPO1KHZ>;
+	er32k-select = <KINETIS_SIM_ER32KSEL_OSC32KCLK>;
 };
 
 &cpu0 {
@@ -107,3 +107,19 @@
 	pinctrl-0 = <&pinmux_uart2>;
 	pinctrl-names = "default";
 };
+
+&rtc {
+	status = "okay";
+};
+
+&pit0 {
+	status = "okay";
+};
+
+&pit0_channel0 {
+	status = "okay";
+};
+
+&pit0_channel1 {
+	status = "okay";
+};