Merge branch 'xip_zdata' of http://git.linaro.org/people/nicolas.pitre/linux into devel-testing

This contains important fixes to the XIP linker script, some more linker
script cleanups, .bss clearing and .data copying speedups related to the
above, and an opt-in config option for XIP kernels that allows for
compressing .data in ROM that depend on those other patches to work
properly.