toolchain: add Z_GENERIC_DOT_SECTION() macro
toolchain: add Z_GENERIC_DOT_SECTION() macro

This is similar to Z_GENERIC_SECTION() but the resulting
section name has a period as prefix. This eases the need
to create a section name macro for both assembly and C.

Signed-off-by: Daniel Leung <d94e04d205b5962d7873a139ef298b03c1717f72@intel.com>

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