Blender Git Loki

Cycles: Adapt volumetric lambda functions to work on MSL

This patch adapts the existing volumetric read/write lambda functions for Metal. Lambda expressions are not supported on MSL, so two new macros `VOLUME_READ_LAMBDA` and `VOLUME_WRITE_LAMBDA` have been defined with a default implementation which, on Metal, is overridden to use inline function objects.

This patch also removes the last remaining mention of the now-unused `ccl_addr_space`.

Ref T92212

Reviewed By: leesonw

Maniphest Tasks: T92212

Differential Revision: https://developer.blender.org/D13234