3430 clock: add emulation clocks

3430 clock: add emulation clocks

Add clocks for the EMU domain for OMAP3430.  Richard Woodruff mentions that
documentation for these clocks, beyond the register bit settings found
in the main 3430 TRM, can be found in several other documents: the 3430
Emulation TRM; also SPRU893 and SPRU928; and some documents from
ARM Ltd including CoreSight, ETM, and ARM debug v5 architecture.
Some information is also available in the ARM Cortex-A8 TRM, section 10.1.

Also, rename existing emul_* clocks to emu_* to conform with recent TRMs.

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