Update changelog for M7

...and M6 and M5...

Change-Id: I5f900e6e4ab4807491dbd783f69caae9792b3ab1
Fix changelog typos

Change-Id: If217913697ccde09e3eeb8ae32b5bb429c925b1c
Merge branch 'cm-11.0' of https://github.com/CyanogenMod/android_vendor_cm into cm-11.0