Fix voice key on phone device

This change,
- changes voice key code back to -102
- renames some key code names and method names
- adds mic_slash_holo to drawable-hdpi

Change-Id: I8be3a20921f472ece4298edad2d275f29a7e4955
diff --git a/java/res/values/keycodes.xml b/java/res/values/keycodes.xml
index 54fa610..6c18cb4 100644
--- a/java/res/values/keycodes.xml
+++ b/java/res/values/keycodes.xml
@@ -19,13 +19,13 @@
 -->
 
 <resources>
+    <!-- These code should be aligned with Keyboard.CODE_*. -->
     <integer name="key_tab">9</integer>
     <integer name="key_return">10</integer>
     <integer name="key_space">32</integer>
     <integer name="key_shift">-1</integer>
     <integer name="key_switch_alpha_symbol">-2</integer>
     <integer name="key_delete">-5</integer>
-    <!-- Keycode for F1 (function) key. This one switches between language switch & comma/.com -->
     <integer name="key_settings">-100</integer>
     <integer name="key_voice">-102</integer>
 </resources>