greybus: kernel_ver: add sg copy operations for kernel < 3.11
For older kernel, < 3.11, no copy to/from buffer with skip support was defined. This could break builds for this versions of kernel. Add them here. Signed-off-by: Rui Miguel Silva <rui.silva@linaro.org> Tested-by: Mark Greer <mgreer@animalcreek.com> Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
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