alphaplus: drop 64-bit rfsa sensor libs

These are seemingly misplaced in this location, as the checksums are
identical between the ones in lib and in lib64.

Drop the "64-bit" one, as it seems to be a dud and it also breaks
extract-utils blueprint generation.

Change-Id: I77020ce36c60d3cb4bc62a0678ec1a970cbcf62b

proprietary-files.txt

@@ -88,8 +88,6 @@ vendor/lib/rfsa/adsp/mmecns_module.so.1
 vendor/lib/rfsa/adsp/sm_fluence_sb_module.so.1
 vendor/lib/rfsa/adsp/smecns_v2_module.so.1
 vendor/lib/rfsa/adsp/smecns_v2_module_fv9.so.1
-vendor/lib64/rfsa/adsp/libsns_device_mode_skel.so
-vendor/lib64/rfsa/adsp/libsns_low_lat_stream_skel.so
 
 # Audio amplifier firmware
 vendor/firmware/Tfa9872.cnt