linker: arm: add SRAM3/4 linker section
linker: arm: add SRAM3/4 linker section

Add a linker section for SRAM3/4 if it is enabled in the device tree.

Signed-off-by: Mario Jaun <d103db3e4f8d66d8732068e0cadccabd9c55aeb3@gmail.com>

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