misc: amd-sbi: Add helper function to prepare I3C support

misc: amd-sbi: Add helper function to prepare I3C support

New AMD processors support APML connection over I3C.
Move the code, common for both I2C and I3C to new helper
function, "sbrmi_common_probe()"
While at it, renaming the static structure regmap_config "sbrmi_i2c_regmap_config"
to "sbrmi_regmap_config" to avoid confusion.

Reviewed-by: Naveen Krishna Chatradhi <naveenkrishna.chatradhi@amd.com>
Signed-off-by: Akshay Gupta <akshay.gupta@amd.com>
Link: https://patch.msgid.link/20250915103649.1705078-1-akshay.gupta@amd.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>