update_kernel_afdo: use gsutil.py instead of gsutil

This changes update_kernel_afdo to call gsutil.py instead of
gsutil (without the ".py"). Reason: the non-.py does not exist
everywhere, whereas gsutil.py is part of depot_tools.

BUG=None
TEST=./afdo_tools/update_kernel_afdo

Change-Id: I7c2192f5d4ef85852a4c5023edb29e9a092bbb8d
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/toolchain-utils/+/2490652
Tested-by: Bob Haarman <inglorion@chromium.org>
Reviewed-by: George Burgess <gbiv@chromium.org>
Reviewed-by: Manoj Gupta <manojgupta@chromium.org>
diff --git a/afdo_tools/update_kernel_afdo b/afdo_tools/update_kernel_afdo
index 8eb1306..a677bf1 100755
--- a/afdo_tools/update_kernel_afdo
+++ b/afdo_tools/update_kernel_afdo
@@ -60,12 +60,12 @@
 do
   # Sort the gs output by timestamp (default ordering is by name, so
   # R86-13310.3-1594633089.gcov.xz goes after R86-13310.18-1595237847.gcov.xz)
-  latest=$(gsutil ls -l "$GS_BASE/$kver/" | sort -k2 | \
+  latest=$(gsutil.py ls -l "$GS_BASE/$kver/" | sort -k2 | \
            grep "R${canary}" | tail -1 || true)
   if [ -z "$latest" ]
   then
     # if no profiles exist for R${canary}, try the previous branch
-    latest=$(gsutil ls -l "$GS_BASE/$kver/" | sort -k2 | \
+    latest=$(gsutil.py ls -l "$GS_BASE/$kver/" | sort -k2 | \
              grep "R${beta}" | tail -1)
   fi