Add support for sun8i-h3, the Allwinner H3. For this SoC, the device tree

Add support for sun8i-h3, the Allwinner H3.  For this SoC, the device tree
contains a single clock control unit node that handles most clocks.  The
driver handles this through tables that describe the gating, reset signals
and the clock hierarchy.  This description is (deliberately) incomplete.  We
will add clocks on an as-needed basis.  You will need a recent device tree,
that includes a "allwinner,sun8i-h3-ccu" compatible node for things to work.

ok patrick@