clk: basic clock hardware types

Many platforms support simple gateable clocks, fixed-rate clocks,
adjustable divider clocks and multi-parent multiplexer clocks.

This patch introduces basic clock types for the above-mentioned hardware
which share some common characteristics.

Based on original work by Jeremy Kerr and contribution by Jamie Iles.
Dividers and multiplexor clocks originally contributed by Richard Zhao &
Sascha Hauer.

Signed-off-by: Mike Turquette <[email protected]>
Signed-off-by: Mike Turquette <[email protected]>
Reviewed-by: Andrew Lunn <[email protected]>
Tested-by: Andrew Lunn <[email protected]>
Reviewed-by: Rob Herring <[email protected]>
Cc: Russell King <[email protected]>
Cc: Jeremy Kerr <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: Arnd Bergman <[email protected]>
Cc: Paul Walmsley <[email protected]>
Cc: Shawn Guo <[email protected]>
Cc: Sascha Hauer <[email protected]>
Cc: Jamie Iles <[email protected]>
Cc: Richard Zhao <[email protected]>
Cc: Saravana Kannan <[email protected]>
Cc: Magnus Damm <[email protected]>
Cc: Mark Brown <[email protected]>
Cc: Linus Walleij <[email protected]>
Cc: Stephen Boyd <[email protected]>
Cc: Amit Kucheria <[email protected]>
Cc: Deepak Saxena <[email protected]>
Cc: Grant Likely <[email protected]>
Signed-off-by: Arnd Bergmann <[email protected]>

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