drivers: clock: stm32: h7: fixed domain clock configuration

In some case, we may need to describe a domain clock for a device
while there is no way to configure it.

Signed-off-by: Hugues Fruchet <[email protected]>

Author: hfruchet-st

drivers/clock_control/clock_stm32_ll_h7.c

@@ -406,6 +406,11 @@ static int stm32_clock_control_configure(const struct device *dev,
 		return err;
 	}
 
+	if (pclken->enr == NO_SEL) {
+		/* Domain clock is fixed. Nothing to set. Exit */
+		return 0;
+	}
+
 	z_stm32_hsem_lock(CFG_HW_RCC_SEMID, HSEM_LOCK_DEFAULT_RETRY);
 
 	sys_clear_bits(DT_REG_ADDR(DT_NODELABEL(rcc)) + STM32_DT_CLKSEL_REG_GET(pclken->enr),