qcacmn: Fix header include bug

This is a qcacld-2.0 to qcacld-3.0 propagation.

In file ar9888def.h error: '_AR9888DEF_H_' is used as a header guard here,
followed by #define of a different macro [-Werror,-Wheader-guard]

ar9888def.h: note: 'AR9888__AR9888DEF_H_' is defined here; did you mean '_AR9888DEF_H_'?

Fix the header file include guard properly.

Change-Id: Ic05a829eadbf974598370c494a5cff10201ec600
CRs-Fixed: 1091052

hif/src/ar9888def.h

@@ -26,7 +26,7 @@
  */
 
 #ifndef _AR9888DEF_H_
-#define AR9888__AR9888DEF_H_
+#define _AR9888DEF_H_
 
 /* Base Addresses */
 #define AR9888_RTC_SOC_BASE_ADDRESS                     0x00004000