Fix the broken links when generating NDK NNAPI reference docs

Bug: 183018724
Test: build ndk with 'm ndk', run doxgen to generate the reference doc
Change-Id: I8bd69b020836d9f8dd47ea097c328ad0db2c640b
Merged-In: I8bd69b020836d9f8dd47ea097c328ad0db2c640b
(cherry picked from commit fe2d3c92ebeec38d240b26320225df8d2dda630c)
3 files changed