drivers: can: mcan: Fix flag overflow for some MCUs

The number of extended filters can be up to 15 for MCUs like the NXP
LPC55Sxx series, so the flags don't fit into uint8_t.

Fixes #53417

Signed-off-by: Martin Jäger <[email protected]>

Author: martinjaeger

drivers/can/can_mcan.h

@@ -180,8 +180,8 @@ struct can_mcan_data {
 	void *state_change_cb_data;
 	uint32_t std_filt_rtr;
 	uint32_t std_filt_rtr_mask;
-	uint8_t ext_filt_rtr;
-	uint8_t ext_filt_rtr_mask;
+	uint16_t ext_filt_rtr;
+	uint16_t ext_filt_rtr_mask;
 	struct can_mcan_mm mm;
 	bool started;
 	void *custom;