counter: stm32-lptimer-cnt: add support for stm32mp25

Add support for STM32MP25 SoC. Use newly introduced compatible to handle
this new HW variant, even if no major change is expected on the counter
driver.

Signed-off-by: Fabrice Gasnier <fabrice.gasnier@foss.st.com>
Change-Id: I7f7b8a6150ccb9980216dd40d44e8a1ea27d9b20
Reviewed-on: https://gerrit.st.com/c/mpu/oe/st/linux-stm32/+/384675
Reviewed-by: Cheick TRAORE <cheick.traore-ext@st.com>
ACI: CIBUILD <MDG-smet-aci-builds@list.st.com>
ACI: CITOOLS <MDG-smet-aci-reviews@list.st.com>
Tested-by: Cheick TRAORE <cheick.traore-ext@st.com>

Author: Fabrice Gasnier

drivers/counter/stm32-lptimer-cnt.c

@@ -502,6 +502,7 @@ static SIMPLE_DEV_PM_OPS(stm32_lptim_cnt_pm_ops, stm32_lptim_cnt_suspend,
 
 static const struct of_device_id stm32_lptim_cnt_of_match[] = {
 	{ .compatible = "st,stm32-lptimer-counter", },
+	{ .compatible = "st,stm32mp25-lptimer-counter", },
 	{},
 };
 MODULE_DEVICE_TABLE(of, stm32_lptim_cnt_of_match);