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

Conflicts:
	res/xml/cdma_options.xml

Change-Id: I2e3ddf75e6102d4b716f00004fb1453703d62ac8