hwmon: (abituguru3) Use pr_fmt and pr_<level>

Added #define pr_fmt KBUILD_MODNAME ": " fmt
Converted printks to pr_<level>
Coalesced any long formats
Removed prefixes from formats
Added a few static strings to standardize logging messages.

Signed-off-by: Joe Perches <joe@perches.com>
Signed-off-by: Guenter Roeck <guenter.roeck@ericsson.com>