FROMLIST: doc: android: Add simple guide for A/B updates

Add a short documentation for A/B enablement and 'ab_select' command
usage.

Bug: 137034204
Change-Id: I2fb2a6f2d68d512d5248d7ca455f3093470d1d33
Link: https://patchwork.ozlabs.org/patch/1128010/
Signed-off-by: Ruslan Trofymenko <ruslan.trofymenko@linaro.org>
Signed-off-by: Igor Opaniuk <igor.opaniuk@gmail.com>
Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org>
Reviewed-by: Alistair Strachan <astrachan@google.com>
Reviewed-by: Sam Protsenko <semen.protsenko@linaro.org>
Reviewed-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Alistair Delva <adelva@google.com>
1 file changed