Update the DaVinci clock framework to handle clk_get(dev, name)
better, adding davinci_clk_associate() method letting logical
names be associated with devices.  This lets drivers move away
from using "physical" clock names, which are changed in new chip
versions and by adding more controller instances.

Plus a few unrelated fixes to the DM355 clock tree:  it doesn't
have IDE or EMAC, or their clocks, so don't list them.  But it
does have two more SPI controllers ... list them instead.
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Kevin Hilman <khilman@deeprootsystems.com>