[PATCH] ARM: move read_{boot,persistent}_clock to the architecture level

[Tony Lindgren]

* Marc Zyngier <marc.zyngier at arm.com> [120428 05:49]:
> At the moment, read_persistent_clock is implemented at the
> platform level, which makes it impossible to compile these
> platforms in a single kernel.
> 
> Implement these two functions at the architecture level, and
> provide a thin registration interface for both read_boot_clock
> and read_persistent_clock. The two affected platforms (OMAP and
> Tegra) are converted at the same time.
> 
> Compile tested only.

Sorry I'm a bit behind with emails again..

Boot tested on omap1 and omap2/3/4:

Tested-by: Tony Lindgren <tony at atomide.com>