make: add 'deb' target for creating deb packages

When 'make deb' is run create a libhsakmt.deb archive that installs
libhsakmt into the appropriate folder on the target where the dymanic
linker can find it.

Change-Id: I32de7198975f7831e509a67371e78456982b5c42

Makefile

@@ -2,6 +2,9 @@
 
 all: lnx64a
 
+deb:
+	$(MAKE) -C src deb
+
 lnx64a:
 	$(MAKE) -C src lnx64a