iwlwifi: acpi: fix wgds rev 3 size

The exact size of WGDS revision 3 was calculated using the wrong
parameters. Fix it.

Signed-off-by: Miri Korenblit <miriam.rachel.korenblit@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
Link: https://lore.kernel.org/r/iwlwifi.20211204130722.12c5b0cffe52.I7f342502f628f43a7e000189a699484bcef0f562@changeid


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