ARM: OMAP2+: hwmod_core: enable optional clocks before main clock

The optional clocks must be enabled before the main clock after the
transition to clkctrl controlled clocks is done. Otherwise the module
we attempt to enable might be stuck in transition.

Reported-by: Keerthy <j-keerthy@ti.com>
Tested-by: Keerthy <j-keerthy@ti.com>
Signed-off-by: Tero Kristo <t-kristo@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>