aospm_shift: track vendor/shift/proprietary

Change-Id: I2b9a3abb9f0829177c12235987232df2d8106c36
Signed-off-by: Alexander Martinz <amartinz@shiftphones.com>
diff --git a/aospm_shift.xml b/aospm_shift.xml
index 7fc503f..81c08e9 100644
--- a/aospm_shift.xml
+++ b/aospm_shift.xml
@@ -8,4 +8,5 @@
   <project path="device/shift/axolotl-kernel" name="aospm_device_shift_axolotl-kernel" revision="main" remote="shift" clone-depth="1" />
 
   <project path="vendor/shift/manifest" name="aospm_manifest" revision="main" remote="shift" />
+  <project path="vendor/shift/proprietary" name="aospm_vendor_shift_proprietary" revision="main" remote="shift" />
 </manifest>