Add htm and html extensions to the map as "text/html"
Add htm and html extensions to the map as "text/html"

* Fixes #2192935
* Exchange attachment handling depends on MimeTypeMap to determine the
  mime type of attachments based on their file extension

Change-Id: I44bbc36d7a5aa0800f072553274346d4547f8d4c

xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base