kvm, arm: Move ARM-specific files to arch/arm/kvm/

This changeset moves the ARM-specific KVM CPU implementation to
arch/arm/kvm/. This change is expected to keep the source tree
somewhat cleaner as we start adding support for ARMv8 and KVM
in-kernel interrupt controller simulation.

--HG--
rename : src/cpu/kvm/ArmKvmCPU.py => src/arch/arm/kvm/ArmKvmCPU.py
rename : src/cpu/kvm/arm_cpu.cc => src/arch/arm/kvm/arm_cpu.cc
rename : src/cpu/kvm/arm_cpu.hh => src/arch/arm/kvm/arm_cpu.hh

src/cpu/kvm/SConscript

@@ -48,10 +48,7 @@ if env['USE_KVM']:
     Source('perfevent.cc')
     Source('timer.cc')
 
-    if env['TARGET_ISA'] == 'arm':
-        SimObject('ArmKvmCPU.py')
-        Source('arm_cpu.cc')
-    elif env['TARGET_ISA'] == 'x86':
+    if env['TARGET_ISA'] == 'x86':
         SimObject('X86KvmCPU.py')
         Source('x86_cpu.cc')