pvr: Implement vkCreateSampler and vkDestroySampler APIs.

Implements vkCreateSampler and vkDestroySampler APIs.

Also fixes maxSamplerLodBias value from 15.0f to 16.0f
as it's the max supported by our hardware.

Also changing maxSamplerAnisotropy from 16.0f to 1.0f to
temporarily disable anisotropy as we are missing software
support for it.

Signed-off-by: Rajnesh Kanwal <rajnesh.kanwal@imgtec.com>
Reviewed-by: Frank Binns <frank.binns@imgtec.com>
Part-of: <!15557>
35 jobs for !15557 with dev/implement_sampler in 11 minutes and 55 seconds (queued for 9 seconds)
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