Add libadbd_auth to adbd's required list.

It seems like we might not be tracking dependencies properly on
devices with flattened APEXes? Add libadbd_auth to adbd's required
list to work around this for now.

Bug: http://b/148812347
Test: `ls $ANDROID_PRODUCT_OUT/system/lib/libadbd_auth.so` before and after when building a go device
Change-Id: If60abeb00797e37bf6a5a037249a21877e0b3d26