vndk-def: Separate SP-NDK from HL-NDK.

This commit separates SP-NDK from HL-NDK.  In the latest design, to
allow HIDL Executables / Libs to use OpenGL-related libraries, SP-NDK is
spun off from HL-NDK.

Test: ./tests/test_ndk_libs.py
Change-Id: Ifafd71df8c517d88fb50d5027f4fcfec76ed5d4f
2 files changed