wifi: iwlwifi: acpi: check DSM func validity

The DSM func 0 (DSM_FUNC_QUERY) returns a bitmap of which
other functions contain valid data, query and check it
before returning other functions data.

Fixes: 9db93491 ("iwlwifi: acpi: support device specific method (DSM)")
Closes: https://bugzilla.kernel.org/show_bug.cgi?id=220085


Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Miri Korenblit <miriam.rachel.korenblit@intel.com>
Link: https://patch.msgid.link/20250828095500.881e17ff8f6a.Ic6d92997d9d5fad127919d6e1b830cd3fe944468@changeid