tegra3_clocks: Don't need trace info for fail clock freq changes

-Aparently we are changing the clock freq before a regulator has
been initialized. Need to look in to this a bit more but for now
I think we can do without the stack trace.

-Will probably be reverted later.
cpu: removed some log spam temporarily

-These messages are filling up the log before I get a chance to
examine them.

-Probably but a debug switch in later but for now...