wifi: iwlwifi: simplify getting DSM from ACPI

wifi: iwlwifi: simplify getting DSM from ACPI

As DSMs are going to be read from UEFI too, we need a unified API
to get DSMs for both ACPI and UEFI.

The difference in getting DSM in each one of these methods (ACPI, UEFI)
is in the GUID, revision (0 for ACPI, 4 for UEFI), and size of the DSM
values (8 or 32 for ACPI, 32 for UEFI).

Therefore, change the iwl_acpi_get_dsm_x() to iwl_acpi_get_dsm() which
determines the GUID, revision (these two are the same for all WiFi DSMs),
and size (based on a func-to-size mapping) internally.

While at it, fix DSM_FUNC_RFI_CONFIG to expect a 32-bit value
(as defined in Intel BIOS spec) and not a 8-bit one.

Signed-off-by: Miri Korenblit <miriam.rachel.korenblit@intel.com>
Reviewed-by: Gregory Greenman <gregory.greenman@intel.com>
Link: https://msgid.link/20240201155157.1bcd7072a7a5.I344ee0a11abbc27da0c693187d1b8bee653aaeef@changeid
Signed-off-by: Johannes Berg <johannes.berg@intel.com>