Moving $OUT/vendor-ramdisk-debug.cpio.lz4 to intermediate dir

Therefore, no need to remove vendor-ramdisk-debug.cpio.lz4
for installclean as it will not be installed to $OUT dir.

Bug: None
Test: make vendorbootimage_debug
Change-Id: Ib7fb9931c55a9bb24e5ca8c4a80bd72f7233c57f