RMX1971: Allow gettid call for atfwd

We never know what upstream is thinking:
W ATFWD-daemon: libminijail[4756]: failed to get path of fd 3: No such file or directory
W ATFWD-daemon: libminijail[4756]: allowing syscall: connect
W ATFWD-daemon: libminijail[4756]: allowing syscall: fcntl
W ATFWD-daemon: libminijail[4756]: allowing syscall: sendto
W ATFWD-daemon: libminijail[4756]: allowing syscall: socket
W ATFWD-daemon: libminijail[4756]: allowing syscall: writev
W ATFWD-daemon: libminijail[4756]: logging seccomp filter failures
E ATFWD-daemon: libminijail[4756]: blocked syscall: gettid

Change-Id: I42e638f9f25395b37df57471fce68cc73e11e83f
Signed-off-by: Kyuofox <kyuofox@gmail.com>
Signed-off-by: kaderbava <ksbava7325@gmail.com>