libmediandk: use libandroid_runtime_lazy

libmediandk and libbinder_ndk have a duplicate code
that loads libandroid_runtime lazily. That part has been extracted
into its own library: libandroid_runtime_lazy.

Bug: 125550121
Test: m -j
Test: readelf -d $OUT/system/lib64/libmediandk.so | grep NEED
Test: # see if there is not libandroid_runtime)
Change-Id: If7cde2f9d3076cec4e69fd8f6e7b19c99804f42e