Support for reading low-bitdepth float formats in Blitter

Support for reading low-bitdepth float formats in Blitter

Added support for reading the following formats in the Blitter:
- VK_FORMAT_B10G11R11_UFLOAT_PACK32
- VK_FORMAT_E5B9G9R9_UFLOAT_PACK32

Fixes all failures in:
[dEQP-VK.api.copy_and_blit.core.blit_image.all_formats.color]
.b10g11r11_ufloat_pack32.*
.e5b9g9r9_ufloat_pack32.*

Bug b/119620767

Change-Id: Ie5824b59b0193115cc7d142efc41cc3ac516c05c
Reviewed-on: https://swiftshader-review.googlesource.com/c/23348
Reviewed-by: Chris Forbes <chrisforbes@google.com>
Tested-by: Alexis Hétu <sugoi@google.com>