hwmon: Add support for SB-RMI power module

On AMD platforms the Out-of-band access is provided by
Advanced Platform Management Link (APML), APML is a
SMBus v2.0 compatible 2-wire processor client interface.
APML is also referred as the sideband interface (SBI).

APML is used to communicate with the
Side-Band Remote Management Interface (SB-RMI) which provides
Soft Mailbox messages to manage power consumption and
power limits of the CPU socket.

- This module add support to read power consumption,
  power limit & max power limit and write power limit.
- To instantiate this driver on a Board Management Controller (BMC)
  connected to an AMD CPU with SB-RMI support, the i2c bus number
  would be the bus connected from the BMC to the CPU.

Reviewed-by: Guenter Roeck <[email protected]>
Signed-off-by: Akshay Gupta <[email protected]>
Signed-off-by: Naveen Krishna Chatradhi <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
[groeck: Fix uninitialized variable problem when reporting max power]
Signed-off-by: Guenter Roeck <[email protected]>

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