Add cpmodem_shim

Change-Id: I469fe04efac7b6636f9d2d1a8ae93c6c1ac30dc1
diff --git a/cpmodem_shim/Kbuild b/cpmodem_shim/Kbuild
new file mode 100644
index 0000000..880321d
--- /dev/null
+++ b/cpmodem_shim/Kbuild
@@ -0,0 +1,2 @@
+obj-m	+= cpmodem_shim.o
+ccflags-y += $(EXTRA_CFLAGS)