dts: riscv32: microsemi-miv: add flash and sram
dts: riscv32: microsemi-miv: add flash and sram

Add flash and SRAM to the Microsemi MiV device tree.

Signed-off-by: Filip Kokosinski <15ac8876ac1a5305e50b11a5381cbe599b2262b1@internships.antmicro.com>
Signed-off-by: Mateusz Holenko <1a79f421828d0048009fccfd7504972981cac7dd@antmicro.com>

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