More lv2 SysCalls & More minor changes

Added dummy lv2 Syscalls: sys_trace_*, sys_rwlock_*, sys_rsx_*

Added sys_time_get_timezone (144) to sys_time.

Added small warning to sys_timer.

Improved cellVideoOutGetDeviceInfo function.

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Warning: As I said in my previous commit, I haven't been able to check
if any of these changes is actually working. Keep that in mind!

Note: I am wondering why was cellVideoOutGetDeviceInfo previously
defined as a 'void' function. I hope it was just an oversight...