Add some basic point/angle related math utilities.

Change-Id: I64cf1b23c218525af9edb1cc1088cca8772b49d6
diff --git a/aos/util/BUILD b/aos/util/BUILD
index 902cb00..99ae87d 100644
--- a/aos/util/BUILD
+++ b/aos/util/BUILD
@@ -37,6 +37,23 @@
 )
 
 cc_library(
+    name = "math",
+    hdrs = ["math.h"],
+    deps = [
+        "//third_party/eigen",
+    ],
+)
+
+cc_test(
+    name = "math_test",
+    srcs = ["math_test.cc"],
+    deps = [
+        ":math",
+        "//aos/testing:googletest",
+    ],
+)
+
+cc_library(
     name = "death_test_log_implementation",
     hdrs = [
         "death_test_log_implementation.h",
@@ -69,8 +86,8 @@
         "phased_loop.h",
     ],
     deps = [
-        "//aos/time:time",
         "//aos/logging",
+        "//aos/time",
     ],
 )
 
@@ -80,8 +97,8 @@
         "log_interval.h",
     ],
     deps = [
-        "//aos/time:time",
         "//aos/logging",
+        "//aos/time",
     ],
 )
 
@@ -129,8 +146,8 @@
         "-lm",
     ],
     deps = [
-        "//aos/time:time",
         "//aos/logging",
+        "//aos/time",
         "//third_party/eigen",
     ],
 )
@@ -216,7 +233,7 @@
         "linked_list.h",
     ],
     deps = [
-        "//aos/transaction:transaction",
+        "//aos/transaction",
     ],
 )