spmi: pmic-arb: Fix some compile warnings about members not being described

Fix the following compile warnings:

 warning: Function parameter or struct member 'core' not described in 'spmi_pmic_arb'
 warning: Function parameter or struct member 'core_size' not described in 'spmi_pmic_arb'
 warning: Function parameter or struct member 'mapping_table_valid' not described in 'spmi_pmic_arb'
 warning: Function parameter or struct member 'pmic_arb' not described in 'pmic_arb_read_data'
 warning: Function parameter or struct member 'pmic_arb' not described in 'pmic_arb_write_data'

Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>
Signed-off-by: Abel Vesa <abel.vesa@linaro.org>
Link: https://lore.kernel.org/r/20240417-spmi-multi-master-support-v10-3-5bc6d322e266@linaro.org


Signed-off-by: Stephen Boyd <sboyd@kernel.org>
Link: https://lore.kernel.org/r/20240507210809.3479953-9-sboyd@kernel.org


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>