kernel.bbclass: explicitly set workdir in do_bundle_initramfs
bitbake rev
67a7b8b02 "build: don't use $B as the default cwd for
functions" (included in current bitbake master) breaks the assumption
that do_bundle_initramfs runs inside the build directory.
This causes kernel_do_compile() as called from within
do_bundle_initramfs() to fail, as the former is not being executed
from the correct directory anymore. (Note that kernel_do_compile()
as called from bitbake directly doesn't suffer from that problem,
as it inherits the workdir from base_do_compile() in that case.)
Set workdir explicitly.
Signed-off-by: André Draszik <git@andred.net>
Signed-off-by: Ross Burton <ross.burton@intel.com>
