tests: Add CPU switching tests

This changeset adds a set of tests that stress the CPU switching
code. It adds the following test configurations:

 * tsunami-switcheroo-full -- Alpha system (atomic, timing, O3)
 * realview-switcheroo-atomic -- ARM system (atomic<->atomic)
 * realview-switcheroo-timing -- ARM system (timing<->timing)
 * realview-switcheroo-o3 -- ARM system (O3<->O3)
 * realview-switcheroo-full -- ARM system (atomic, timing, O3)

Reference data is provided for the 10.linux-boot test case. All of the
tests trigger a CPU switch once per millisecond during the boot
process.

The in-order CPU model was not included in any of the tests as it does
not support CPU handover.

tests/SConscript

@@ -301,7 +301,8 @@ if env['TARGET_ISA'] == 'alpha':
                 'tsunami-simple-timing-dual',
                 'twosys-tsunami-simple-atomic',
                 'tsunami-o3', 'tsunami-o3-dual',
-                'tsunami-inorder']
+                'tsunami-inorder',
+                'tsunami-switcheroo-full']
 if env['TARGET_ISA'] == 'sparc':
     configs += ['t1000-simple-atomic',
                 't1000-simple-timing']
@@ -314,7 +315,11 @@ if env['TARGET_ISA'] == 'arm':
                 'realview-simple-timing-dual',
                 'realview-o3',
                 'realview-o3-checker',
-                'realview-o3-dual']
+                'realview-o3-dual',
+                'realview-switcheroo-atomic',
+                'realview-switcheroo-timing',
+                'realview-switcheroo-o3',
+                'realview-switcheroo-full']
 if env['TARGET_ISA'] == 'x86':
     configs += ['pc-simple-atomic',
                 'pc-simple-timing',