Revert "LAKITU: Set EGIT_MASTER=main for some llvm packages"

This reverts commit eebb188560d1fc2ca21d2554965e28552a32c14d.

Reason for revert: This change is not needed when using git-r3.eclass

BUG=b/195995730
TEST=presubmit
RELEASE_NOTE=None

Change-Id: I7e3f4cb825d9cd1975a550cb231e07c42469ab0a
Reviewed-on: https://cos-review.googlesource.com/c/third_party/overlays/chromiumos-overlay/+/20796
Tested-by: Cusky Presubmit Bot <presubmit@cos-infra-prod.iam.gserviceaccount.com>
Reviewed-by: Dexter Rivera <riverade@google.com>
diff --git a/chromeos/config/env/sys-devel/llvm b/chromeos/config/env/sys-devel/llvm
index f3f477a..c8ca095 100644
--- a/chromeos/config/env/sys-devel/llvm
+++ b/chromeos/config/env/sys-devel/llvm
@@ -6,5 +6,3 @@
 cros_pre_src_prepare_filter_sanitizers() {
 	tc-is-clang && append-flags "-fno-sanitize=vptr"
 }
-
-EGIT_MASTER="main"
diff --git a/chromeos/config/env/sys-libs/libcxx b/chromeos/config/env/sys-libs/libcxx
index bbff30e..fc031b6 100644
--- a/chromeos/config/env/sys-libs/libcxx
+++ b/chromeos/config/env/sys-libs/libcxx
@@ -5,5 +5,3 @@
 cros_pre_src_prepare_enable_cxx_exceptions() {
       cros_enable_cxx_exceptions
 }
-
-EGIT_MASTER="main"
diff --git a/chromeos/config/env/sys-libs/libcxxabi b/chromeos/config/env/sys-libs/libcxxabi
index d8922e1..4abc671 100644
--- a/chromeos/config/env/sys-libs/libcxxabi
+++ b/chromeos/config/env/sys-libs/libcxxabi
@@ -7,5 +7,3 @@
 cros_pre_src_prepare_enable_cxx_exceptions() {
 	cros_enable_cxx_exceptions
 }
-
-EGIT_MASTER="main"