Add LTE overlays for signal strength indicators.

Note that operators that wish to show "4G" instead of "LTE"
on these networks can set config_show4GForLTE to true.

Bug: 9265513
Bug: 9265217
Change-Id: If7f3580da7266b0d0c62639e30684393d4e03392

Conflicts:
	packages/SystemUI/res/drawable-hdpi/ic_qs_signal_full_lte.png
	packages/SystemUI/res/drawable-hdpi/ic_qs_signal_lte.png
	packages/SystemUI/res/drawable-hdpi/stat_sys_data_fully_connected_lte.png
	packages/SystemUI/res/drawable-ldrtl-hdpi/ic_qs_signal_full_lte.png
	packages/SystemUI/res/drawable-ldrtl-hdpi/ic_qs_signal_lte.png
	packages/SystemUI/res/drawable-ldrtl-hdpi/stat_sys_data_fully_connected_lte.png
	packages/SystemUI/res/drawable-ldrtl-mdpi/ic_qs_signal_full_lte.png
	packages/SystemUI/res/drawable-ldrtl-mdpi/ic_qs_signal_lte.png
	packages/SystemUI/res/drawable-ldrtl-mdpi/stat_sys_data_fully_connected_lte.png
	packages/SystemUI/res/drawable-ldrtl-xhdpi/ic_qs_signal_full_lte.png
	packages/SystemUI/res/drawable-ldrtl-xhdpi/ic_qs_signal_lte.png
	packages/SystemUI/res/drawable-ldrtl-xhdpi/stat_sys_data_fully_connected_lte.png
	packages/SystemUI/res/drawable-mdpi/ic_qs_signal_full_lte.png
	packages/SystemUI/res/drawable-mdpi/ic_qs_signal_lte.png
	packages/SystemUI/res/drawable-mdpi/stat_sys_data_fully_connected_lte.png
	packages/SystemUI/res/drawable-xhdpi/ic_qs_signal_full_lte.png
	packages/SystemUI/res/drawable-xhdpi/ic_qs_signal_lte.png
	packages/SystemUI/res/drawable-xhdpi/stat_sys_data_fully_connected_lte.png
	packages/SystemUI/res/values/config.xml
	packages/SystemUI/src/com/android/systemui/statusbar/policy/NetworkController.java
	packages/SystemUI/src/com/android/systemui/statusbar/policy/TelephonyIcons.java