[AArch64] Delete an unneeded dependency on Object after 1874dee5662603c9251228c71b66de72cec0c979

1874dee5662603c9251228c71b66de72cec0c979 moved CPU_(SUB_)TYPE logic to
BinaryFormat. Object is not directly referenced.
diff --git a/llvm/lib/Target/AArch64/MCTargetDesc/LLVMBuild.txt b/llvm/lib/Target/AArch64/MCTargetDesc/LLVMBuild.txt
index d4e2b2d..81eb8be 100644
--- a/llvm/lib/Target/AArch64/MCTargetDesc/LLVMBuild.txt
+++ b/llvm/lib/Target/AArch64/MCTargetDesc/LLVMBuild.txt
@@ -18,6 +18,6 @@
 type = Library
 name = AArch64Desc
 parent = AArch64
-required_libraries = AArch64Info AArch64Utils MC Support Object BinaryFormat
+required_libraries = AArch64Info AArch64Utils MC BinaryFormat Support
 add_to_library_groups = AArch64