qcacmn: Fix clang warning: redefinition of typedef 'qdf_mutex_t'

drivers/staging/qcacld-3.0/../qca-wifi-host-cmn/qdf/linux/src/qdf_lock.c:42:23:
warning: redefinition of typedef 'qdf_mutex_t' is a C11 feature [-Wtypedef-redefinition]
typedef __qdf_mutex_t qdf_mutex_t;
                      ^
drivers/staging/qcacld-3.0/../qca-wifi-host-cmn/qdf/inc/qdf_lock.h:240:23:
note: previous definition is here
typedef __qdf_mutex_t qdf_mutex_t;

Change-Id: Ib8a66843e22595d5ba07a38606032679c3c1b46d
CRs-Fixed: 2055513

qdf/linux/src/qdf_lock.c

@@ -37,9 +37,6 @@
 #endif
 #include <i_qdf_lock.h>
 
-/* Function declarations and documenation */
-typedef __qdf_mutex_t qdf_mutex_t;
-
 /**
  * qdf_mutex_create() - Initialize a mutex
  * @m: mutex to initialize