qcacld-3.0: Remove last bit of LIBRA_LINUX_PC feature code

A prior version of the driver had LIBRA_LINUX_PC feature code, but it
has all been removed except for one piece, so remove that last bit
which conditionally defines HDD_TX_TIMEOUT.

Change-Id: Ie714b134b789a4649f8da7bbf5e98f36d27ed4ff
CRs-Fixed: 2362718

core/hdd/inc/wlan_hdd_main.h

@@ -161,11 +161,7 @@ static inline bool in_compat_syscall(void) { return is_compat_task(); }
 #define HDD_NETDEV_TX_QUEUE_LEN (3000)
 
 /** Hdd Tx Time out value */
-#ifdef LIBRA_LINUX_PC
-#define HDD_TX_TIMEOUT          (8000)
-#else
 #define HDD_TX_TIMEOUT          msecs_to_jiffies(5000)
-#endif
 
 #define HDD_TX_STALL_THRESHOLD 4