mem-ruby: fix typo in GPU VIPER TCC comment
mem-ruby: fix typo in GPU VIPER TCC comment

72ee6d1a fixed a deadlock in the GPU VIPER TCC.  However, it
inadvertently added a typo to the comments explaining the change.  This
commit fixes that.

Change-Id: Ibba835aa907be33fc3dd8e576ad2901d5f8f509c
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/51687
Maintainer: Matt Sinclair <d2406197fb1bedd1e23c70c50c510ff0e9ab0f5b@gmail.com>
Reviewed-by: Jason Lowe-Power <92de577f37050ad05b60626d2f17913f40dcb1a2@gmail.com>
Tested-by: kokoro <2ac7b1f3fa578934c95181d4272be0d3bca00121@google.com>

gem5/gem5,gem5/gem5,gem5/gem5,gem5/gem5,gem5/gem5,gem5/gem5,gem5/gem5