- Replaced sw::Viewport with VkViewport

Bug b/118386749

Change-Id: I2446883ba9e5623753322fc417386394a3fe370c
Reviewed-on: https://swiftshader-review.googlesource.com/c/22909Tested-by: Alexis Hétu <sugoi@google.com>
Reviewed-by: Nicolas Capens <nicolascapens@google.com>