microblaze: Wire-up memfd_create syscall

Add new memfd_create syscall.
Signed-off-by: NMichal Simek <michal.simek@xilinx.com>

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

@@ -401,5 +401,6 @@
 #define __NR_renameat2		383
 #define __NR_seccomp		384
 #define __NR_getrandom		385
+#define __NR_memfd_create	386
 
 #endif /* _UAPI_ASM_MICROBLAZE_UNISTD_H */

arch/microblaze/kernel/syscall_table.S

@@ -386,3 +386,4 @@ ENTRY(sys_call_table)
 	.long sys_renameat2
 	.long sys_seccomp
 	.long sys_getrandom		/* 385 */
+	.long sys_memfd_create