* commit '1642edb5208fe02ef64d5734fffaf7c4a724fd2f':
bionic: store property names as variable-length strings
bionic: prevent root processes from calling __system_property_add
bionic: revert to a single (larger) property area
bionic: reimplement property area as hybrid trie/binary tree
bionic: add missing memory barriers to system properties
bionic: make property area expandable