OMAP2 clock: drop CONFIG_PARTICIPANT clock flag

OMAP2 clock: drop CONFIG_PARTICIPANT clock flag

The CONFIG_PARTICIPANT flags indicates to the clock rate and parent
changing functions that they should not be used on this clock.  Better
just to remove the clock function pointers that operate on those
clocks.  The name of the flag is just terrible: its meaning has almost
nothing to do with its name, and the use of the CONFIG_ prefix makes
it appear to be a Kconfig option.  Get rid of it.

Signed-off-by: Paul Walmsley <paul@pwsan.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>