fw-api: CL 25746138 - update fw common interface files

WMI: change variable-length arrays to not use [0] or [1]
Modify defs of WMI TLV structs that have variable-length arrays of the form type name[0]; or type name[1]; to instead have type name[];, while ensuring the size of the TLV struct remains unchanged.

Change-Id: I43e03ec0e426be4732cc1bded837fb5aaad36756
CRs-Fixed: 2262693