staging: iio: light: ltr659: Fix buggy code

staging: iio: light: ltr659: Fix buggy code

1. Name should be ltr558 so that user space driver can
identify that device exists.
2. print regulator errors only if regulator enable/disable
fail.

Bug 1469642

Change-Id: I6cc16631bcd56f8eaccc40a2d8c4ac6fec940c48
Signed-off-by: Sri Krishna chowdary <schowdary@nvidia.com>
Reviewed-on: http://git-master/r/383196
(cherry picked from commit 746bdb36ba5c86088dff053496f01c39025a55d6)
Reviewed-on: http://git-master/r/384308
Reviewed-by: Automatic_Commit_Validation_User
Reviewed-by: Robert Shih <rshih@nvidia.com>
Reviewed-by: Eric Chuang <echuang@nvidia.com>
Reviewed-by: Wayne Hsu <wahsu@nvidia.com>
Reviewed-by: Sachin Nikam <snikam@nvidia.com>