Merge remote-tracking branch 'remotes/dgibson/tags/ppc-for-3.0-20180709' into staging

ppc patch queue 2018-07-09

Here's a final pull request before tomorrow's hard freeze.

There are a number of fixes and improvements to the sm501 display
driver (not strictly ppc related, but used only on ppc and SH).
There's also a handful of unrelated fixes.

Whether all the sm501 changes are bugfixes is somewhat debatable, but
Peter has indicated he's ok with merging those for 3.0.

# gpg: Signature made Mon 09 Jul 2018 08:42:15 BST
# gpg:                using RSA key 6C38CACA20D9B392
# gpg: Good signature from "David Gibson <david@gibson.dropbear.id.au>"
# gpg:                 aka "David Gibson (Red Hat) <dgibson@redhat.com>"
# gpg:                 aka "David Gibson (ozlabs.org) <dgibson@ozlabs.org>"
# gpg:                 aka "David Gibson (kernel.org) <dwg@kernel.org>"
# Primary key fingerprint: 75F4 6586 AE61 A66C C44E  87DC 6C38 CACA 20D9 B392

* remotes/dgibson/tags/ppc-for-3.0-20180709:
  sam460ex: Make sam460ex_load_device_tree() handle all errors internally
  sam460ex: Don't check for errors from qemu_fdt_*()
  sam460ex: Check for errors from libfdt functions
  sam460ex: Update u-boot-sam460ex firmware
  ppc: fix default VGA display for PReP machines
  target/ppc: fix build on ppc64 host
  ppc440_uc: Fix a copy/paste error
  sm501: Set updated region dirty after 2D operation
  sm501: Fix support for non-zero frame buffer start address
  sm501: Log unimplemented raster operation modes
  sm501: Implement negated destination raster operation mode
  sm501: Use values from the pitch register for 2D operations
  sm501: Perform a full update after palette change
  sm501: Implement i2c part for reading monitor EDID
  spapr/vio: quiet down the "irq" property accessors
  ppc: fix default VGA display for Mac machines

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>