clk: add clk_bulk_get accessories

These helper function allows drivers to get several clk consumers in
one operation. If any of the clk cannot be acquired then any clks
that were got will be put before returning to the caller.

This can relieve the driver owners' life who needs to handle many clocks,
as well as each clock error reporting.

Cc: Michael Turquette <[email protected]>
Cc: Stephen Boyd <[email protected]>
Cc: Russell King <[email protected]>
Cc: Geert Uytterhoeven <[email protected]>
Cc: "Rafael J. Wysocki" <[email protected]>
Cc: Viresh Kumar <[email protected]>
Cc: Mark Brown <[email protected]>
Cc: Shawn Guo <[email protected]>
Cc: Fabio Estevam <[email protected]>
Cc: Sascha Hauer <[email protected]>
Cc: Anson Huang <[email protected]>
Cc: Robin Gong <[email protected]>
Cc: Bai Ping <[email protected]>
Cc: Leonard Crestez <[email protected]>
Cc: Octavian Purdila <[email protected]>
Signed-off-by: Dong Aisheng <[email protected]>
Signed-off-by: Stephen Boyd <[email protected]>

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