wifi: iwlwifi: mvm: initialize the rx_vec before using it

wifi: iwlwifi: mvm: initialize the rx_vec before using it

Initialize the phy_data.rx_vec for both version-3 and above
where it is 4-byte data size and below version which has
data size of 2-byte.
The data will be sent uninitialized in called function if
notification version is less than three.

Signed-off-by: Mukesh Sisodiya <mukesh.sisodiya@intel.com>
Signed-off-by: Gregory Greenman <gregory.greenman@intel.com>
Link: https://lore.kernel.org/r/20230613155501.a6bb856f04bc.I9a15075f3dad61dcabdcd1ed0d34cf3e8ec5453f@changeid
Signed-off-by: Johannes Berg <johannes.berg@intel.com>