remove vcd from user ROM

Bug: 190331325
Test: build all ROM variants with only user ROM without vcd
Change-Id: I0732f80c2adc663c807963b84c70080665212bb2
diff --git a/modem/userdebug.mk b/modem/userdebug.mk
new file mode 100644
index 0000000..87697a7
--- /dev/null
+++ b/modem/userdebug.mk
@@ -0,0 +1,2 @@
+PRODUCT_PACKAGES += vcd
+BOARD_VENDOR_SEPOLICY_DIRS += device/google/gs101-sepolicy/modem/userdebug/