build compiler-rt for armv7a-cros-linux-gnueabihf

It turns out we still need compiler-rt for armv7a-cros-linux-gnueabihf.
Previously, we remove it because it has installation conflict with
armv7a-cros-linux-gnueabi. However, we need this package to build the whole
armv7a-cros-linux-gnueabihf toolchain. The installation conflict problem
can be avoided if these two sets of toolchain does not appear in the
same board(chroot).

BUG=chromium:711369
TEST=None

Change-Id: Idef04f29667930bf612eb4d4d016f33ca9e66dec
Reviewed-on: https://chromium-review.googlesource.com/706065
Commit-Ready: Yunlian Jiang <yunlian@chromium.org>
Tested-by: Yunlian Jiang <yunlian@chromium.org>
Reviewed-by: Manoj Gupta <manojgupta@chromium.org>
Reviewed-by: Mike Frysinger <vapier@chromium.org>
diff --git a/scripts/cros_setup_toolchains.py b/scripts/cros_setup_toolchains.py
index 71bfc78..60cfdab 100644
--- a/scripts/cros_setup_toolchains.py
+++ b/scripts/cros_setup_toolchains.py
@@ -72,7 +72,7 @@
 # Enable llvm's compiler-rt for these targets.
 TARGET_COMPILER_RT_ENABLED = (
     'armv7a-cros-linux-gnueabi',
-    #'armv7a-cros-linux-gnueabihf',
+    'armv7a-cros-linux-gnueabihf',
     'aarch64-cros-linux-gnu',
 )
 CROSSDEV_COMPILER_RT_ARGS = ['--ex-pkg', 'sys-libs/compiler-rt']