OMAP clock: rearrange clock.h structure order

... to eliminate unnecessary padding.  We have rather a lot of these
structures, so eliminating unnecessary padding results in a saving of
1488 bytes.

[paul@pwsan.com: updated against current linux-omap clock tree, now saves
1512 bytes on OMAP3 builds]

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