Enhance syzkaller startup process to check for not_present_syscalls

Modified the syzkaller_start function to include a wait mechanism that checks for the "machine check:" log entry before proceeding with not_present_syscalls check. This ensures that syzkaller has fully started before checking for not present syscalls, improving reliability in the startup sequence on slow systems like RCar-S4.

Signed-off-by: Pablo Ridolfi pridolfi@redhat.com