regulator: Constify constraints name
authorMark Brown <broonie@opensource.wolfsonmicro.com>
Fri, 14 Oct 2011 12:36:04 +0000 (13:36 +0100)
committerMark Brown <broonie@opensource.wolfsonmicro.com>
Fri, 14 Oct 2011 19:59:30 +0000 (20:59 +0100)
There's no need for the API to modify it and having it const makes it
easier to use with random strings the board code has.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

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