kernel-build: Mount and run in $WORKSPACE not $HOME

When running docker we bind mount and run in $HOME, but that only
works if $WORKSPACE is under $HOME. Instead we can just bind mount and
run in $WORKSPACE.

Change-Id: I872621fc7d92c5b6721e77e2a3048c41b14d9529
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Joel Stanley <joel@jms.id.au>
1 file changed