Mark libexif as double_loadable

libexif is a VNDK lib and also used indirectly by LLNDK(libmediandk)
which means this lib can be double-loaded.
(deps: libmediandk -> libmedia_jni -> libexif)

Bug: 121280180
Test: m -j
Change-Id: I00a06c43239b6fb5305a9bcc8dd61eb7ca8d1ae4
1 file changed