Release 4.4.39-openpower1

 - Add "drivers/gpu/drm/ast: Fix infinite loop if read fails" to avoid
   hanging when probing the the Aspeed graphics device. This is queued in
   drm-misc-fixes[1]

 - Move to latest upstream stable release 4.4.39

[1] https://patchwork.kernel.org/patch/9477147/

Signed-off-by: Joel Stanley <joel@jms.id.au>
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