regulator: Add devm_regulator_get()

Add a resource managed regulator_get() to simplify regulator
usage in drivers. This allows driver authors to "get and forget"
about their regulators by automatically calling regulator_put()
when the driver is detached.

[Fixed up a couple of coding style issues -- broonie]

Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
diff --git a/Documentation/driver-model/devres.txt b/Documentation/driver-model/devres.txt
index 10c64c8..016fd2b 100644
--- a/Documentation/driver-model/devres.txt
+++ b/Documentation/driver-model/devres.txt
@@ -267,3 +267,6 @@
   pcim_iounmap()
   pcim_iomap_table()	: array of mapped addresses indexed by BAR
   pcim_iomap_regions()	: do request_region() and iomap() on multiple BARs
+
+REGULATOR
+  devm_regulator_get()