power: add back check for ro.vendor.extension_library

This partially reverts I0ce40bbefb8c867dda8ee5eb1f948af2106e692d,
"power: Using PerfHAL API".

Especially older systems don't provide libqti-perfd-client.so but this
is hardcoded since the aforementioned change.  Use the former code
checking for ro.vendor.extension_library and try to load that library if
the property exists before falling back to loading
libqti-perfd-client.so.

Change-Id: If89e3b88062be10af7cfd43b6ba92a22fda32754
Signed-off-by: Corinna Vinschen <xda@vinschen.de>
1 file changed