Don't check the vndk lib list for 64-bit only product

vndk-check-list check can't be done for 64-bit only product. Some
VNDK libraries (libstagefright_codec_*) are 32-bit only and thus
not built for 64-bit only product. As a result vndk-check-list always
fails on such device. Suppressing the error until the codec libraries
are built with 64-bit.

Bug: 110429754
Test: m -j on hikey64_only
Change-Id: I240ceee3fd0a778e47904ed44a1964084f354141