Add driver for marvell, a37x0 peripheral clocks

[hum_semihalf.com]

Summary

Add driver for Marvell, Armada-37xx peripheral clock.
Register clocks for various peripheral devices in
north bridge or south bridge domain. Dump clock's
domain while verbose boot.

[manu]

Not gonna reviews the clock definitions but the overall looks good, just one question : would it be clearer to split the clock drivers ? (nb and sb in different drivers). They are mostly the same and uses the same type clocks from what I could see but it might be easier to read the code if they are each in one file with their clocks.

[hum_semihalf.com]

Split driver into two separate drivers, each for north bridge or south bridge domain.

[hum_semihalf.com]

Rebase patch on HEAD.