can: cast value 1U to type u64_t in function can_stm32_set_filter
can: cast value 1U to type u64_t in function can_stm32_set_filter

Potentially overflowing expression 1U << register_demand
I changed to (u64_t)1U << register_demand
To avoid overflow, I casted 1U to type u64_t.

Coverity-CID: 190996
Fixes: #13829
Signed-off-by: Maksim Masalski <4eb3679da23cf41c68efaea5c81c9e87b8df5f95@gmail.com>

finikorg/zephyr,GiulianoFranchetto/zephyr,nashif/zephyr,finikorg/zephyr,Vudentz/zephyr,ldts/zephyr,nashif/zephyr,galak/zephyr,ldts/zephyr,ldts/zephyr,GiulianoFranchetto/zephyr,ldts/zephyr,zephyrproject-rtos/zephyr,ldts/zephyr,finikorg/zephyr,Vudentz/zephyr,Vudentz/zephyr,Vudentz/zephyr,zephyrproject-rtos/zephyr,zephyrproject-rtos/zephyr,zephyrproject-rtos/zephyr,nashif/zephyr,galak/zephyr,GiulianoFranchetto/zephyr,GiulianoFranchetto/zephyr,galak/zephyr,Vudentz/zephyr,Vudentz/zephyr,galak/zephyr,galak/zephyr,finikorg/zephyr,finikorg/zephyr,zephyrproject-rtos/zephyr,nashif/zephyr,nashif/zephyr,GiulianoFranchetto/zephyr