[ARM] OMAP3 clock: fix 96MHz clocks

Fix some bugs in the OMAP3 clock tree pertaining to the 96MHz clocks.
The 96MHz portion of the clock tree should now have reasonable
fidelity to the 34xx TRM Rev I.

One remaining question mark: it's not clear exactly which 96MHz source
clock the USIM uses.  This patch sticks with the previous setting, which
seems reasonable.

linux-omap source commit is 15c706e8179ce238c3ba70a25846a36b73bd2359.

Signed-off-by: Paul Walmsley <paul@pwsan.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>