include: toolchain: Add LOG2CEIL macro
include: toolchain: Add LOG2CEIL macro

This macro is referenced by most of the architecture linker scripts, yet
it is only defined in the Metaware toolchain linker header.

Signed-off-by: Bradley Bolen <a46f022a58b40f08f87b914d58da7dec46dba40c@lexmark.com>

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