avr32: wire up pkey syscalls

This patch wires up the new pkey_mprotect, pkey_alloc and pkey_free syscalls on
AVR32.

arch/avr32/include/uapi/asm/unistd.h

@@ -340,5 +340,8 @@
 #define __NR_copy_file_range    325
 #define __NR_preadv2            326
 #define __NR_pwritev2           327
+#define __NR_pkey_mprotect      328
+#define __NR_pkey_alloc         329
+#define __NR_pkey_free          330
 
 #endif /* _UAPI__ASM_AVR32_UNISTD_H */

arch/avr32/kernel/syscall_table.S

@@ -341,4 +341,7 @@ sys_call_table:
 	.long __sys_copy_file_range
 	.long __sys_preadv2
 	.long __sys_pwritev2
+	.long sys_pkey_mprotect
+	.long sys_pkey_alloc
+	.long sys_pkey_free /* 330 */
 	.long sys_ni_syscall /* r8 is saturated at nr_syscalls */