debian: Install header and source file to different directory

osmo-bts consumes the gsm_data_shared.{h,c} files and assumes the
OpenBSC directory layout. Install the files into the specific
sub-directories to make the --with-openbsc=dir option work.

Change-Id: I3da21402dee3d6f1d812b232b0a3f13b8a462d5b
diff --git a/debian/openbsc-dev.install b/debian/openbsc-dev.install
index 557aea1..398321a 100644
--- a/debian/openbsc-dev.install
+++ b/debian/openbsc-dev.install
@@ -1,2 +1,3 @@
-openbsc/include/openbsc/gsm_data_shared.h usr/include/osmocom/openbsc/
-openbsc/src/libcommon/gsm_data_shared.c usr/src/osmocom/openbsc/libcommon/
+openbsc/include/openbsc/gsm_data_shared.h usr/src/osmocom/openbsc/openbsc/include/openbsc/
+openbsc/include/openbsc/common_cs.h usr/src/osmocom/openbsc/openbsc/include/openbsc/
+openbsc/src/libcommon/gsm_data_shared.c usr/src/osmocom/openbsc/openbsc/src/libcommon/