config: Update script to set cache line size on system

This patch changes the config scripts such that they do not set the
cache line size per cache instance, but rather for the system as a
whole.

configs/example/se.py

@@ -159,7 +159,8 @@ np = options.num_cpus
 system = System(cpu = [CPUClass(cpu_id=i) for i in xrange(np)],
                 physmem = MemClass(range=AddrRange(options.mem_size)),
                 mem_mode = test_mem_mode,
-                clk_domain = SrcClockDomain(clock = options.sys_clock))
+                clk_domain = SrcClockDomain(clock = options.sys_clock),
+                cache_line_size = options.cacheline_size)
 
 # Create a separate clock domain for the CPUs
 system.cpu_clk_domain = SrcClockDomain(clock = options.cpu_clock)