supplicant(interface): Correct the WFD info length

Error logs from test:
03-17 18:34:34.303  1781  1781 E wpa_supplicant: Unexpected WFD device
info len: 6

Bug: 36401779
Test: Compiles
Change-Id: I65805599f8f3242a5c1f6ba8c0a1b9da05df79b4
diff --git a/wifi/supplicant/1.0/ISupplicantP2pIface.hal b/wifi/supplicant/1.0/ISupplicantP2pIface.hal
index 5a0f600..fb4323c 100644
--- a/wifi/supplicant/1.0/ISupplicantP2pIface.hal
+++ b/wifi/supplicant/1.0/ISupplicantP2pIface.hal
@@ -611,7 +611,7 @@
    *         |SupplicantStatusCode.FAILURE_UNKNOWN|,
    *         |SupplicantStatusCode.FAILURE_IFACE_INVALID|
    */
-  setWfdDeviceInfo(uint8_t[8] info) generates (SupplicantStatus status);
+  setWfdDeviceInfo(uint8_t[6] info) generates (SupplicantStatus status);
 
   /**
    * Creates a NFC handover request message.