Update CleanSpec to remove generated files from IVold.aidl.

Bug: 112058806
Test: Device booted after flashing a build with this change.
Change-Id: If0bda6869a7ed09b8c320b5c44c43f9d4cb4c3dd
Merged-In: If0bda6869a7ed09b8c320b5c44c43f9d4cb4c3dd
diff --git a/CleanSpec.mk b/CleanSpec.mk
index 37c423d..fa664ba 100644
--- a/CleanSpec.mk
+++ b/CleanSpec.mk
@@ -493,6 +493,8 @@
 
 $(call add-clean-step, find $(PRODUCT_OUT) -type f -name "vr_hwc*" -print0 | xargs -0 rm -f)
 
+$(call add-clean-step, rm -rf $(SOONG_OUT_DIR)/.intermediates/system/vold)
+
 # ************************************************
 # NEWER CLEAN STEPS MUST BE AT THE END OF THE LIST
 # ************************************************