Fixed issue with traversing sub directories when variables are passed on the command line
Fixed issue with traversing sub directories when variables are passed on the command line

When traversing subdirectories for building the -C <subdir> option for make was used.
For some reason this caused issues when passing a parameter to the command line,
such as FOO=BAR. In that case the toplevel Makefile with its SUBDIRS declaration
was called instead of the one in the sub directory. Replacing the -C <subdir>
with cd <subdir> resolves the issue.

Signed-off-by: Rudolf J Streif <3a3f8ba70589896d7aa2a0a0d3bcf865c0bd58b4@jaguarlandrover.com>

rstreif/vehicle_signal_interface,rstreif/vehicle_signal_interface,rstreif/vehicle_signal_interface