Revert "make_device_config.sh: Fix target path in generated dependency file"

Revert "make_device_config.sh: Fix target path in generated dependency file"

This reverts commit 23bf49b5eca716aaad073f2b47613434e1515cb5.

While *-softmmu/config-devices.mak.d is included through *.d pattern via
Makefile.target, the make_devices_config.sh call these dependencies are
for is in ./Makefile. Therefore revert to original behavior.

This should unbreak pci.mak dependencies not propagating.

Reported-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Andreas Färber <afaerber@suse.de>
Signed-off-by: Blue Swirl <blauwirbel@gmail.com>