In order to eventually remove sw::Surface, some utility
functions used by vk::Image were copied to vk::Format.

Bug b/126883332

Change-Id: Ie8404b70adc3336d536dcd5c0ec26b63e46c5174
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/26872Tested-by: Alexis Hétu <sugoi@google.com>
Reviewed-by: Nicolas Capens <nicolascapens@google.com>