CDMA: Fix APN setting crash when using CDMA SIM card.

Orginal introduce a incorrect APN activity name, so APN setting crashed.

Change from com.android.settings.ApnSettings to
com.android.settings.Settings$ApnSettingsActivity

Change-Id: Ie1e6fa6ca22cca40d0fcf0911acfade1bee7dde4
Merge branch 'cm' into HEAD