clk: Add support for enabling/disabling clocks from debugfs

For test and debug purposes, it's simple enough to enable or disable
clocks from shell. Add a new debugfs file 'clk_prepare_enable' that
calls clk_prepare_enable() when writing "1" and clk_disable_unprepare()
when writing "0".

This can have security implications, so only support it when the code
has been modified to #define CLOCK_ALLOW_WRITE_DEBUGFS.

Signed-off-by: Mike Tipton <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
[[email protected]: Reword commit text and remove comment update]
Signed-off-by: Stephen Boyd <[email protected]>

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