Relax max_anisotropy validation

[teoxoy]

wgpu/wgpu-core/src/device/mod.rs

Lines 1181 to 1185 in a50836e

	let valid_clamp =
	clamp <= hal::MAX_ANISOTROPY && conv::is_power_of_two_u32(clamp as u32);
	if !valid_clamp {
	return Err(resource::CreateSamplerError::InvalidClamp(clamp));
	}

Note: Most implementations support maxAnisotropy values in range between 1 and 16, inclusive. The used value of maxAnisotropy will be clamped to the maximum value that the platform supports.

from https://gpuweb.github.io/gpuweb/#dom-gpusamplerdescriptor-maxanisotropy

Filed gpuweb/gpuweb#3671 to check for non power of two behavior.