boards: st: stm32mp257f_ev1: use correct tag for denoting CAN support

Use the correct tag ("can") to denote CAN support for the ST
STM32MP257F-EV1.

Signed-off-by: Henrik Brix Andersen <henrik@brixandersen.dk>

Author: henrikbrixandersen

boards/st/stm32mp257f_ev1/stm32mp257f_ev1_stm32mp257fxx_m33.yaml

@@ -12,7 +12,7 @@ supported:
   - i2c
   - i3c
   - spi
-  - fdcan
+  - can
 testing:
   ignore_tags:
     - cmsis_rtos_v2