bits/syscall.h: add memfd_secret from linux v5.14

see

    linux commit 7bb7f2ac24a028b20fca466b9633847b289b156a
    arch, mm: wire up memfd_secret system call where relevant

    linux commit 1507f51255c9ff07d75909a84e7c0d7f3c4b2f49
    mm: introduce memfd_secret system call to create "secret" memory areas

    linux commit b633896314c0f78f2b4eb7b19a530d68f2a35445
    tools headers UAPI: Sync s390 syscall table file that wires up the
    memfd_secret syscall

arch/i386/bits/syscall.h.in

@@ -436,4 +436,5 @@
 #define __NR_landlock_create_ruleset	444
 #define __NR_landlock_add_rule	445
 #define __NR_landlock_restrict_self	446
+#define __NR_memfd_secret	447
 

arch/s390x/bits/syscall.h.in

@@ -362,4 +362,5 @@
 #define __NR_landlock_create_ruleset	444
 #define __NR_landlock_add_rule	445
 #define __NR_landlock_restrict_self	446
+#define __NR_memfd_secret	447
 

arch/x32/bits/syscall.h.in

@@ -308,6 +308,7 @@
 #define __NR_landlock_create_ruleset	(0x40000000 + 444)
 #define __NR_landlock_add_rule	(0x40000000 + 445)
 #define __NR_landlock_restrict_self	(0x40000000 + 446)
+#define __NR_memfd_secret	(0x40000000 + 447)
 
 
 #define __NR_rt_sigaction (0x40000000 + 512)

arch/x86_64/bits/syscall.h.in

@@ -355,4 +355,5 @@
 #define __NR_landlock_create_ruleset	444
 #define __NR_landlock_add_rule	445
 #define __NR_landlock_restrict_self	446
+#define __NR_memfd_secret	447