Do not clamp ambiguous snorms values on vkCmdCopy*() functions

Do not clamp ambiguous snorms values on vkCmdCopy*() functions

As per Vulkan WG agreed, these functions perform a bit-for-bit copy
of the values, even if the result is unrepresentable.

Reverts:

* "Fixes sparse resource SNORM tests"
  -> 00e745999e771df2a604bf24d85594a69ad441fe

* "copies_and_blitting: fix ambiguous signed normalized 1.0 value"
  -> bce4ec47056a0473ccce9cf7951023da80c3b745

Affects:
dEQP-VK.api.copy_and_blit.*.image_to_image.all_formats.color.*.r32_sfloat.a8b8g8r8_snorm_pack32*
dEQP-VK.api.copy_and_blit.*.image_to_image.all_formats.color.*.r32_sfloat.r8g8b8a8_snorm.*
dEQP-VK.sparse_resources.image_sparse_binding.*snorm*
dEQP-VK.sparse_resources.mipmap_sparse_residency.*snorm*

VK-GL-CTS issue: 2917
Componentes: Vulkan

Change-Id: I5878379aa78e68ac7452a83c1a64abf01c9472c8
Signed-off-by: Samuel Iglesias Gonsálvez <siglesias@igalia.com>