Pull xaac codec from build

remove references that pull xaac codec into the build; the codec is
still considered experimental and not to be included in product.

Bug: 131342273
Test: compilation
Change-Id: Ic7ff3871c88555bd006c0c79beebada3732a8b8e

media/codec2/vndk/C2Store.cpp

@@ -872,7 +872,6 @@ C2PlatformComponentStore::C2PlatformComponentStore()
     emplace("libcodec2_soft_vp8enc.so");
     emplace("libcodec2_soft_vp9dec.so");
     emplace("libcodec2_soft_vp9enc.so");
-    emplace("libcodec2_soft_xaacdec.so");
 }
 
 c2_status_t C2PlatformComponentStore::copyBuffer(

services/mediacodec/registrant/Android.bp

@@ -49,7 +49,6 @@ cc_library_shared {
         "libcodec2_soft_flacdec",
         "libcodec2_soft_flacenc",
         "libcodec2_soft_gsmdec",
-        "libcodec2_soft_xaacdec",
     ],
 }