These functions now only accept channels, since reload slots can
never be independently active.  Change parameter to unsinged, to
allow a minor code shrink.  Remove pointless foof in edma_stop():
the channel's parameter RAM slot must be reinitialized, so there
is no reason to modify it unless chaining is being misused; and
just updating the link register can't protect aginst chain bugs.
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Kevin Hilman <khilman@deeprootsystems.com>