MIPS64: move fstat64/fstatat64/_flush_cache syscalls to SECCOMP_WHITELIST.TXT

fstat64/fstatat64/_flush_cache were accidentally put in SYSCALLS.TXT in:
    https://android-review.googlesource.com/#/c/390454/

This patch just moves them to SECCOMP_WHITELIST.TXT because we do not
want stubs accidenatally generated for the mentioned syscalls using
gensyscalls.py script.

This commit does not introduce any functional changes to mips64_policy.cpp.

Test: Run genseccomp.py -> File seccomp/mips64_policy.cpp not changed.
Test: Run gensyscalls.py -> INFO:root:no changes detected!

Change-Id: I3b527b3d9f18715c44a4e6ddc6db6e49f48f4890
Signed-off-by: Miodrag Dinic <miodrag.dinic@imgtec.com>
diff --git a/libc/SECCOMP_WHITELIST.TXT b/libc/SECCOMP_WHITELIST.TXT
index d2ab20e..4cc4f6f 100644
--- a/libc/SECCOMP_WHITELIST.TXT
+++ b/libc/SECCOMP_WHITELIST.TXT
@@ -36,6 +36,9 @@
 int	rt_tgsigqueueinfo:int rt_tgsigqueueinfo(pid_t tgid, pid_t tid, int sig, siginfo_t *uinfo)	all
 int	restart_syscall:int restart_syscall()	all
 int	getrandom:int getrandom(void *buf, size_t buflen, unsigned int flags) all
+int	fstatat64|fstatat:newfstatat(int, const char*, struct stat*, int)	mips64
+int	fstat64|fstat:fstat(int, struct stat*)	mips64
+int	_flush_cache:cacheflush(char* addr, const int nbytes, const int op)	mips64
 
 # Needed for performance tools
 int	perf_event_open:perf_event_open(struct perf_event_attr *attr, pid_t pid, int cpu, int group_fd, unsigned long flags)	all