drivers: can: stm32fd: fix type of clock rate
drivers: can: stm32fd: fix type of clock rate

the rate_tmp varaiable was int, but should be const uint32_t.

Signed-off-by: Alexander Wachter <e46fc836cca3acec03944314d1457c2ae6c68ef3@wachter.cloud>

zephyrproject-rtos/zephyr,finikorg/zephyr,galak/zephyr,finikorg/zephyr,finikorg/zephyr,zephyrproject-rtos/zephyr,zephyrproject-rtos/zephyr,finikorg/zephyr,galak/zephyr,finikorg/zephyr,galak/zephyr,zephyrproject-rtos/zephyr,galak/zephyr,zephyrproject-rtos/zephyr,galak/zephyr