drivers: regulators: adopt SHELL_HELP

[kartben]

Adopt SHELL_HELP macro for Regulators shell

uart:~$ regulator --help
regulator - Regulator playground
Subcommands:
  enable      : Enable the regulator
                Usage: enable <device>
  disable     : Disable the regulator
                Usage: disable <device>
  is_enabled  : Get regulator status
                Usage: is_enabled <device>
  vlist       : List supported voltages
                Usage: vlist <device>
  vset        : Set voltage
                The input requires units, e.g. 200mv, 20.5mv, 10uv, 1v...
                Usage: vset <device> <minimum> [<maximum>]
                       If maximum is not set, exact voltage will be requested
  vget        : Get voltage
                Usage: vget <device>
  clist       : List supported current limits
                Usage: clist <device>
  iset        : Set current limit
                The input requires units, e.g. 200ma, 20.5ma, 10ua, 1a...
                Usage: iset <device> <minimum> [<maximum>]
                       If maximum is not set, exact current will be requested
  iget        : Get current limit
                Usage: iget <device>
  modeset     : Set the mode of the regulator
                Usage: modeset <device> <mode identifier>
  modeget     : Get the mode of the regulator
                Usage: modeget <device>
  adset       : Set active discharge status
                Usage: adset <device> <enable|disable>
  adget       : Get active discharge status
                Usage: adget <device>
  errors      : Get active errors
                Usage: errors <device>
  dvsset      : Set dynamic voltage scaling state
                Usage: dvsset <device> <state identifier>
  shipmode    : Enable ship mode
                Usage: shipmode <device>

[sonarqubecloud]

Quality Gate passed

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