clk: vexpress: Add separate SP810 driver

Factor out the SP810 clocking code into a separate driver,
selecting better (faster) parent at clk_prepare() time.
This is to avoid problems with clocking infrastructure
initialisation order, in particular to avoid dependency
of fixed clock being initialized before SP810. It also
makes vexpress platform OF-based clock initialisation code
unnecessary.

Signed-off-by: Pawel Moll <[email protected]>
Tested-by: Catalin Marinas <[email protected]>
Signed-off-by: Mike Turquette <[email protected]>
[[email protected]: add .unprepare, FIXME comment, cleaned up code]

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