layerscape: update README
authorYangbo Lu <yangbo.lu@nxp.com>
Mon, 22 Jan 2018 08:42:05 +0000 (16:42 +0800)
committerJohn Crispin <john@phrozen.org>
Tue, 13 Feb 2018 09:01:51 +0000 (10:01 +0100)
Tis patch is to fix up some descriptions in README.
Per-device rootfs had been supported, and a known issue
had been found. These also should be updated accordingly.

Signed-off-by: Yangbo Lu <yangbo.lu@nxp.com>

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