ARM: shmobile: r8a7794 ALT board DU VGA port enablement V2

ARM: shmobile: r8a7794 ALT board DU VGA port enablement V2

[PATCH v2 01/03] ARM: shmobile: r8a7794: Add DU0 clock [PATCH v2 02/03] ARM: shmobile: r8a7794: Add DU node to device tree [PATCH v2 03/03] ARM: shmobile: r8a7794: alt: Enable VGA port

These patches enable VGA port support for the r8a7794 ALT board. No special merge time dependencies exist, however for correct run time operation v4.4-rc1 is recommended and in particular the patch "drm: rcar-du: Add support for the R8A7794 DU".

Tested with the modetest utility on the r8a7794 ALT board.

# modetest -M rcar-du -c
# modetest -M rcar-du -s 33:1024x768@AR24

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Written against renesas-devel-20151113-v4.3

Changes since V1:
- The first patch in V1 is replaced with r8a7794 integration patches by Laurent from "[PATCH 0/5] R-Car DU: Add support for R8A7793 and R8A7794"
- Patch 3/3 is updated to fit on top of patch 1 and 2.

No special compile time dependencies. Run time dependency on "drm: rcar-du: Add support for the R8A7794 DU" which is present in v4.4-rc1.

 arch/arm/boot/dts/r8a7794-alt.dts         |   61 +++++++++++++++++++++++++++++
 arch/arm/boot/dts/r8a7794.dtsi            |   35 +++++++++++++++-
 include/dt-bindings/clock/r8a7794-clock.h |    1 
 3 files changed, 94 insertions(+), 3 deletions(-)

Thanks, I have queued these up for v4.5.