rtla: Define syscall numbers for riscv

RISC-V uses the same (generic) syscall numbers as ARM64.

Link: https://lkml.kernel.org/r/mvma68wl2ul.fsf@suse.de



Signed-off-by: Andreas Schwab <schwab@suse.de>
Acked-by: Daniel Bristot de Oliveira <bristot@kernel.org>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>