Remove GNU AS from build dependencies

Step 9/Final Step of:
https://android.googlesource.com/platform/prebuilts/clang/host/linux-x86/+/master/BINUTILS_KERNEL_DEPRECATION.md

Bug: 141693040
Signed-off-by: Nick Desaulniers <ndesaulniers@google.com>
Change-Id: I54f595c592b0320d8446c69ac5919acecbcfc818
diff --git a/default.xml b/default.xml
index 35a9d03..9d8be44 100644
--- a/default.xml
+++ b/default.xml
@@ -13,7 +13,6 @@
   <project path="kernel/tests" name="kernel/tests" />
   <project path="kernel/configs" name="kernel/configs" revision="master" />
   <project path="common-modules/virtual-device" name="kernel/common-modules/virtual-device" revision="android-mainline" />
-  <project path="prebuilts/gas/linux-x86" name="platform/prebuilts/gas/linux-x86" clone-depth="1" />
   <project path="prebuilts-master/clang/host/linux-x86" name="platform/prebuilts/clang/host/linux-x86" clone-depth="1" />
   <project path="prebuilts/gcc/linux-x86/host/x86_64-linux-glibc2.17-4.8" name="platform/prebuilts/gcc/linux-x86/host/x86_64-linux-glibc2.17-4.8" clone-depth="1" />
   <project path="prebuilts/boot-artifacts" name="platform/prebuilts/boot-artifacts" />