iwlwifi: acpi: prepare SAR profile selection code for multiple sizes

The SAR profile tables will be larger in the next version, so prepare
the iwl_sar_select_profile() function to handle multiple sizes and
update the relevant callers.

Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
Link: https://lore.kernel.org/r/iwlwifi.20200928121852.da5a95917df4.I84d44c9dd0b858c403a81ca621b5a7b615a3aa7e@changeid


Signed-off-by: Luca Coelho <luciano.coelho@intel.com>