Add <partition>/gpu support to fsgen

Test: m on qualcomm device with
  PRODUCT_COPY_FILES += \
    sequence_manifest.bin:$(TARGET_COPY_OUT_VENDOR)/gpu/kbc/sequence_manifest.bin
Change-Id: I9367c745862970c82bbc099dbe020dabb785ccb4
diff --git a/android/neverallow.go b/android/neverallow.go
index 8a3129f..e67619a 100644
--- a/android/neverallow.go
+++ b/android/neverallow.go
@@ -379,6 +379,7 @@
 			"prebuilt_system",
 			"prebuilt_first_stage_ramdisk",
 			"prebuilt_radio",
+			"prebuilt_gpu",
 		).
 		DefinedInBpFile().
 		Because("module type not allowed to be defined in bp file")