ruby: remove call to curCycle in panic()
The panic() function already prints the current tick value. This call to
curCycle() is as such redundant. Since we are trying to move towards multiple
clock domains, this call will print misleading time.
ruby: remove get_time()
This patch replaces get_time() in *.sm files with curCycle() which
is now possible since controllers are clocked objects.
merged 798c2cec8e37 and e96ff45795bc