IVGCVSW-1970 TfLite VGG16: Use same number of iterations as other tests
IVGCVSW-1970 TfLite VGG16: Use same number of iterations as other tests

I had forgotten that as a workaround for the testing using a different
number of test cases for different hardware backends, we repeat
the expected test results an arbitrary number of times

Change-Id: I4d1ea8daa1cbfd63ebcd7ac93ac30acb5806fafe

ARM-software/armnn,ARM-software/armnn,ARM-software/armnn