gallium: Use util_cpu_to_le{16,32} in many more places.

... and util_le{16,32}_to_cpu. I think I've used the right ones for
describing the actual operation performed (even though they're both just
"byte-swap this if I'm on big-endian").

The Linux Kernel has typedefs __le32/__be32 and friends that static
analysis tools can use to check that byte-orderings are correct. It
might be interesting to apply that here as well.

Reviewed-by: Eric Anholt <[email protected]>
Reviewed-by: Jose Fonseca <[email protected]>

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