Update naming to `aarch32` and `aarch64`.

Change-Id: I40a929b1095ee3e1b2ca5ef879c7006d8b59acc9
diff --git a/tools/config.py b/tools/config.py
index 4fceec7..474c853 100644
--- a/tools/config.py
+++ b/tools/config.py
@@ -27,16 +27,15 @@
 import os
 
 # These paths describe the structure of the repository.
-dir_tools          = os.path.dirname(os.path.realpath(__file__))
-dir_root           = os.path.abspath(os.path.join(dir_tools, '..'))
-dir_build          = os.path.join(dir_root, 'obj')
-dir_build_latest   = os.path.join(dir_build, 'latest')
-dir_src_vixl       = os.path.join(dir_root, 'src')
-dir_tests          = os.path.join(dir_root, 'test')
-dir_a64_benchmarks = os.path.join(dir_root, 'benchmarks/a64')
-dir_a32_benchmarks = os.path.join(dir_root, 'benchmarks/a32')
-dir_a64_examples   = os.path.join(dir_root, 'examples/a64')
-dir_a32_examples   = os.path.join(dir_root, 'examples/a32')
+dir_tools              = os.path.dirname(os.path.realpath(__file__))
+dir_root               = os.path.abspath(os.path.join(dir_tools, '..'))
+dir_build              = os.path.join(dir_root, 'obj')
+dir_build_latest       = os.path.join(dir_build, 'latest')
+dir_src_vixl           = os.path.join(dir_root, 'src')
+dir_tests              = os.path.join(dir_root, 'test')
+dir_aarch64_benchmarks = os.path.join(dir_root, 'benchmarks/aarch64')
+dir_aarch64_examples   = os.path.join(dir_root, 'examples/aarch64')
+dir_aarch32_examples   = os.path.join(dir_root, 'examples/aarch32')
 
 
 # The full list of available build modes.