Add //tools:armhf-debian to the default environment group

Everything builds for the Jetson anyways, so let's just stick to it.
More compilers aren't a bad thing.  This will prevent more of the code
base from needing to be annotated.

Change-Id: I501b384c8073e245f11f0e0c3e5f9b494ad89a66
diff --git a/frc971/BUILD b/frc971/BUILD
index b9987a4..563f05e 100644
--- a/frc971/BUILD
+++ b/frc971/BUILD
@@ -7,9 +7,7 @@
     hdrs = [
         "shifter_hall_effect.h",
     ],
-    compatible_with = mcu_cpus + [
-        "//tools:armhf-debian",
-    ],
+    compatible_with = mcu_cpus,
 )
 
 cc_library(
@@ -17,9 +15,6 @@
     hdrs = [
         "constants.h",
     ],
-    compatible_with = [
-        "//tools:armhf-debian",
-    ],
 )
 
 py_library(