qcacld-3.0: Set length of challenge text sent by SAP to 128

SIR_MAC_AUTH_CHALLENGE_LENGTH is updated to 253 from
128 as per IEEE spec due to connection fails between
DUT-SAP and old ref-STA. Auth failure occurs as encrypted
data sent by ref-STA is only 128 bytes instead of 253
bytes.

Fix is to set length of challenge text sent by SAP
to 128 bytes.

Change-Id: I81409bb58ad34e469c54e2909f45b8a6826eb06a
CRs-Fixed: 2096512

core/mac/inc/sir_mac_prot_def.h

@@ -562,6 +562,7 @@
 #define SIR_MAC_MAX_NUM_OF_DEFAULT_KEYS      4
 #define SIR_MAC_KEY_LENGTH                   13 /* WEP Maximum key length size */
 #define SIR_MAC_AUTH_CHALLENGE_LENGTH        253
+#define SIR_MAC_SAP_AUTH_CHALLENGE_LENGTH    128
 #define SIR_MAC_WEP_IV_LENGTH                4
 #define SIR_MAC_WEP_ICV_LENGTH               4
 #define SIR_MAC_CHALLENGE_ID_LEN             2