mwifiex: set fw api info for backword compatibility

If we dont set FW API info here, for older FW releases where FW API
is not available in GET_HW_SPEC, API version would remain 0.
This may cause issues with 11ac if older FW is used with newer driver.
Signed-off-by: NAvinash Patil <patila@marvell.com>
Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>

drivers/net/wireless/mwifiex/cmdevt.c

@@ -1508,6 +1508,7 @@ int mwifiex_ret_get_hw_spec(struct mwifiex_private *priv,
 	}
 
 	adapter->fw_release_number = le32_to_cpu(hw_spec->fw_release_number);
+	adapter->fw_api_ver = (adapter->fw_release_number >> 16) & 0xff;
 	adapter->number_of_antenna = le16_to_cpu(hw_spec->number_of_antenna);
 
 	if (le32_to_cpu(hw_spec->dot_11ac_dev_cap)) {