Add a new variant device jfltezm.

jfltezm is China Mobile edition Samsug galaxy S4.
It's known as Samsung GT-I9508.
jfltezm's hardware is the same with jfltexx, but support TD-SCDMA network.

Change-Id: I3088e1c996fe312594e1fba1dbddf60aa87289d1
Merge branch 'cm-10.2' of github.com:CyanogenMod/android_device_samsung_jf-common into cm-10.2