Introduce noKeyPreview Key attribute

This change also removes hacks in LatinKeyboardView by utilizing
noKeyPreview attribute.

Bug: 5638595
Change-Id: Icd8a3af3b7849b941f8f5532e2b432e126a909e6
diff --git a/java/res/xml-sw600dp/kbd_phone.xml b/java/res/xml-sw600dp/kbd_phone.xml
index 303f814..49d7f29 100644
--- a/java/res/xml-sw600dp/kbd_phone.xml
+++ b/java/res/xml-sw600dp/kbd_phone.xml
@@ -100,7 +100,7 @@
         </Row>
     <Row>
         <Key
-            latin:keyStyle="tabKeyStyle"
+            latin:keyStyle="numTabKeyStyle"
             latin:keyWidth="11.00%p" />
         <Key
             latin:keyStyle="nonSpecialBackgroundSpaceKeyStyle"