UPSTREAM: doc: overlays: Tweak documentation regarding overlays

Pull some information regarding overlays from commit messages and
put them directly within the documentation. Also add some informatio

UPSTREAM: doc: overlays: Tweak documentation regarding overlays

Pull some information regarding overlays from commit messages and
put them directly within the documentation. Also add some information
regarding required dtc version to properly use overlays.

Change-Id: Idccfd1db39dd27a19415f05738e65ca43413cb25
Signed-off-by: Franklin S Cooper Jr <fcooper@ti.com>
Acked-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Kever Yang <kever.yang@rock-chips.com>
(cherry picked from commit 56fc7032e1771882a086e8283586fc7c733ba6bd)

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UPSTREAM: doc: Document how to apply fdt overlays

We have the capability to apply overlays on the command line but
we didn't have a document explaining how.

Change-Id: Idec1c3eac1ef3b52f4329d2ce9bf

UPSTREAM: doc: Document how to apply fdt overlays

We have the capability to apply overlays on the command line but
we didn't have a document explaining how.

Change-Id: Idec1c3eac1ef3b52f4329d2ce9bffdd8b9aac32b
Signed-off-by: Pantelis Antoniou <pantelis.antoniou@konsulko.com>
Reviewed-by: Łukasz Majewski
Acked-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Kever Yang <kever.yang@rock-chips.com>
(cherry picked from commit d80162cfc559491dee3009b120e7268e9388302f)

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