New class to support commands such as:
$ MACHINE=xxx bitbake yyy -c menuconfig
$ MACHINE=xxx bitbake yyy -c devshell
Kernel options are typically configured via menuconfig.
The file "prj.conf" must be edited manually, hence the need for devshell.
Once in devshell, user can use their favorite editor to edit the file.
For proper operation, these two variables need to be set in
recipes:
ZEPHYR_SRC_DIR : path to the source, typically place with prj.conf
ZEPHYR_BASE: Zephyr kernel tree location
[YOCTO#10657]
Signed-off-by: Juro Bystricky <juro.bystricky@intel.com>
