Add config option for 3.4 kernel workarounds when on JB bootloader

Change-Id: I03bfdd559ee2cc1ff2f6c651183167abc529f928
Add xt897 variant defconfig

Change-Id: I36099570774c5a8c2a24daf6989e1f06e81f6344
Merge "Add config option for 3.4 kernel workarounds when on JB bootloader" into cm-11.0
Merge "Add xt897 variant defconfig" into cm-11.0