audio: remove libdsp_aecns.so from device.mk

Move AEC and NS to the liboffloadeffect

Bug: 187153996
Test: make -j128
Test: run cts --include-filter "CtsMediaTestCases android.media.cts.AudioPreProcessingTest"
Change-Id: Ida949d8ae3c06b4ab6743159cc952cdef3a73de7
1 file changed