Linker: Add ".ARM.extab" section in linker script for Cortex-M
Linker: Add ".ARM.extab" section in linker script for Cortex-M

When using C++ exceptions in a Cortex-M, the linker return a warning:
warning: orphan section ".ARM.extab"
.ARM.extab section containing exception unwinding information.
This section is missing in the linker script for Cortex-M.

Signed-off-by: Benoit Leforestier <643bdb7e1bff6fd5dea65e7d0b3d32ab0e78db80@gmail.com>

punitvara/zephyr,Vudentz/zephyr,explora26/zephyr,nashif/zephyr,galak/zephyr,finikorg/zephyr,finikorg/zephyr,Vudentz/zephyr,nashif/zephyr,GiulianoFranchetto/zephyr,finikorg/zephyr,GiulianoFranchetto/zephyr,finikorg/zephyr,explora26/zephyr,zephyrproject-rtos/zephyr,GiulianoFranchetto/zephyr,explora26/zephyr,ldts/zephyr,ldts/zephyr,Vudentz/zephyr,Vudentz/zephyr,Vudentz/zephyr,galak/zephyr,ldts/zephyr,punitvara/zephyr,explora26/zephyr,GiulianoFranchetto/zephyr,punitvara/zephyr,zephyrproject-rtos/zephyr,galak/zephyr,explora26/zephyr,Vudentz/zephyr,finikorg/zephyr,zephyrproject-rtos/zephyr,nashif/zephyr,ldts/zephyr,ldts/zephyr,galak/zephyr,galak/zephyr,nashif/zephyr,GiulianoFranchetto/zephyr,punitvara/zephyr,punitvara/zephyr,zephyrproject-rtos/zephyr,zephyrproject-rtos/zephyr,nashif/zephyr