Greg Hackmann cb215a7e9e bionic: make property area expandable
The property area is initially one 4K region, automatically expanding as
needed up to 64 regions.

To avoid duplicating code, __system_property_area_init() now allocates
and initializes the first region (previously it was allocated in init's
init_property_area() and initialized in bionic).  For testing purposes,
__system_property_set_filename() may be used to override the file used
to map in regions.

Signed-off-by: Greg Hackmann <ghackmann@google.com>

(cherry picked from commit d32969701be070c0161c2643ee3c3df16066bbb8)

Change-Id: I038d451fe8849b0c4863663eec6f57f6521bf4a7
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