ANGLE needs to be able to sample surfaces in
order to emulate things like glBlitFramebuffer
or use EGL images as textures.

Section 32.3. Required Format Support of the
Vulkan 1.1 spec dictates that all formats
which must support
VK_FORMAT_FEATURE_COLOR_ATTACHMENT_BIT,
also support
VK_IMAGE_USAGE_TRANSFER_SRC_BIT,
VK_IMAGE_USAGE_TRANSFER_DST_BIT,
and VK_IMAGE_USAGE_SAMPLE_BIT.

It should already work properly in SwiftShader,
so this cl just adds the bit.

Bug b/139412450 b/139479506

Change-Id: I0f79d042789a8b6372f75ecf6cda5f28c6955652
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/35709Reviewed-by: Nicolas Capens <nicolascapens@google.com>
Tested-by: Alexis Hétu <sugoi@google.com>