drivers: clock_control: nrf: Add missing flags clearing

When BT dedicated API was turning off the HF clock it was not resetting
status flags. When onoff API was attempting to request HF clock after
that it was detecting unexpected state as status flag was indicating
as if HF clock was on.

Signed-off-by: Krzysztof Chruściński <krzysztof.chruscinski@nordicsemi.no>

drivers/clock_control/clock_control_nrf.c

@@ -442,6 +442,13 @@ void z_nrf_clock_bt_ctlr_hf_release(void)
 	hfclk_users &= ~HF_USER_BT;
 	/* Skip stopping if generic is still requesting the clock. */
 	if (!(hfclk_users & HF_USER_GENERIC)) {
+		struct nrf_clock_control_sub_data *sub_data =
+			get_sub_data(CLOCK_DEVICE, CLOCK_CONTROL_NRF_TYPE_HFCLK);
+
+		/* State needs to be set to OFF as BT API does not call stop API which
+		 * normally setting this state.
+		 */
+		sub_data->flags = CLOCK_CONTROL_STATUS_OFF;
 		hfclk_stop();
 	}