aarch64: Add Huawei Kunpeng to tunable cpu list

Kunpeng processer is a 64-bit Arm-compatible CPU released by Huawei,
and we have already signed a copyright assignement with the FSF.

This patch adds its to cpu list, and related macro for IFUNC.

Checked on aarch64-linux-gnu.

Reviewed-by: Szabolcs Nagy <Szabolcs.Nagy@arm.com>

sysdeps/unix/sysv/linux/aarch64/cpu-features.c

@@ -38,6 +38,7 @@ static struct cpu_list cpu_list[] = {
       {"phecda",	 0x680F0000},
       {"ares",		 0x411FD0C0},
       {"emag",		 0x503F0001},
+      {"kunpeng", 	 0x481FD010},
       {"generic", 	 0x0}
 };