soc: st: add STM32L452XC

Adds STM32 L452 soc with L452xC variant. L452 has 160 KB SRAM;
therefore, mpu mem config has been extended; IRQ number is based on
'stm32l452xx.h'.

Signed-off-by: Georgij Cernysiov <g.cernysiov@elco-automation.de>