Fix svm unit test

Since the -enable-nesting option is no longer available remove the
option from the config file.
Signed-off-by: Conny Seidel <conny.seidel@amd.com>
Signed-off-by: Avi Kivity <avi@redhat.com>

x86/unittests.cfg

@@ -57,7 +57,7 @@ file = rmap_chain.flat
 [svm]
 file = svm.flat
 smp = 2
-extra_params = -enable-nesting -cpu qemu64,+svm
+extra_params = -cpu qemu64,+svm
 
 [svm-disabled]
 file = svm.flat