fix(libspl): fixed that failed to create cstor pool on aarch64

when __aarch64__ is defined, the file sys_defs.h should not define __arm__, otherwise it will cause a logical error in the file libaio.h. After modification, we successfully run on Huawei ARMv8 Kunpeng920 CPU.

Signed-off-by: jjjighg <tangdongyuan@huawei.com>

lib/libspl/include/sys/isa_defs.h

@@ -100,28 +100,41 @@ extern "C" {
 
 #define	_SUNOS_VTOC_16
 
-/* arm arch specific defines */
-#elif defined(__arm) || defined(__arm__) || defined(__aarch64__)
+/* aarch64 arch specific defines */
+#elif defined(__aarch64__)
 
 #if !defined(__arm)
 #define	__arm
 #endif
 
-#if !defined(__arm__)
-#define	__arm__
-#endif
-
-#if defined(__aarch64__)
 #if !defined(_LP64)
 #define	_LP64
 #endif
+
+#if defined(__AARCH64EL__)
+#define	_LITTLE_ENDIAN
 #else
+#define	_BIG_ENDIAN
+#endif
+
+#define	_SUNOS_VTOC_16
+
+/* aarch32 arch specific defines */
+#elif defined(__arm) || defined(__arm__)
+
+#if !defined(__arm)
+#define	__arm
+#endif
+
+#if !defined(__arm__)
+#define	__arm__
+#endif
+
 #if !defined(_ILP32)
 #define	_ILP32
 #endif
-#endif
 
-#if defined(__ARMEL__) || defined(__AARCH64EL__)
+#if defined(__ARMEL__)
 #define	_LITTLE_ENDIAN
 #else
 #define	_BIG_ENDIAN