soc: arm: stm32l5: enable ICACHE

Enable Instruction Cache
Warning: no flash driver yet available for STM32l5
But cache coherency management (cache invalidate)
will be rerquired when implementing flash driver.
ICAHE must be disabled for any flash write opeartion.

Signed-off-by: Alexandre Bourdiol <alexandre.bourdiol@st.com>
1 file changed