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Add generic routines to read or write a byte to battery-backed RAM, and implement vbnvcontext get/set using these routines. BUG=chrome-os-partner:62952 BRANCH=reef TEST=On reef, with subsequent commit, run "cutoff" on the console, reattach AC, and verify device successfully wakes. Also verify Rp is dropped on console 'reboot' and F3 + power from RW. Signed-off-by: Shawn Nematbakhsh <shawnn@chromium.org> Change-Id: I14691923f2e5198e901b6b5199e92c58c68cd18d Reviewed-on: https://chromium-review.googlesource.com/444444 Commit-Ready: Shawn N <shawnn@chromium.org> Tested-by: Shawn N <shawnn@chromium.org> Reviewed-by: Randall Spangler <rspangler@chromium.org>