backports: add devm_regulator_register()

This backports the following commit from mainline:
commit b33e46bcdc4e598d738ed12a5a7906be4e11d786
Author: Mark Brown <broonie@linaro.org>
Date:   Sat Aug 31 11:58:26 2013 +0100

regulator: core: Provide managed regulator registration

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
backports: fixed regulator driver depends on kernel >= 3.13

The fixed voltage regulator depends now on kernel >= 3.13,
it uses regulator_desc.fixed_uV.

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
backports: refresh patches on next-20130920

1   2.6.25              [  OK  ]
2   2.6.26              [  OK  ]
3   2.6.27              [  OK  ]
4   2.6.28              [  OK  ]
5   2.6.29              [  OK  ]
6   2.6.30              [  OK  ]
7   2.6.31              [  OK  ]
8   2.6.32              [  OK  ]
9   2.6.33              [  OK  ]
10  2.6.34              [  OK  ]
11  2.6.35              [  OK  ]
12  2.6.36              [  OK  ]
13  2.6.37              [  OK  ]
14  2.6.38              [  OK  ]
15  2.6.39              [  OK  ]
16  3.0.98              [  OK  ]
17  3.1.10              [  OK  ]
18  3.10.14             [  OK  ]
19  3.11.3              [  OK  ]
20  3.12-rc3            [  OK  ]
21  3.2.51              [  OK  ]
22  3.3.8               [  OK  ]
23  3.4.64              [  OK  ]
24  3.5.7               [  OK  ]
25  3.6.11              [  OK  ]
26  3.7.10              [  OK  ]
27  3.8.13              [  OK  ]
28  3.9.11              [  OK  ]

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>