misc: amd-sbi: Use regmap subsystem

- regmap subsystem provides multiple benefits over direct smbus APIs
- subsystem adds another abstraction layer on top of struct i2c_client to
  make it easy to read or write registers.
- The subsystem can be helpful in following cases
  - Different types of bus (i2c/i3c), we have plans to support i3c.
  - Different Register address size (1byte/2byte)

Reviewed-by: Naveen Krishna Chatradhi <naveenkrishna.chatradhi@amd.com>
Signed-off-by: Akshay Gupta <akshay.gupta@amd.com>
Link: https://lore.kernel.org/r/20250428063034.2145566-5-akshay.gupta@amd.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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