zink: handle non-const offsets for txf/tg4 ops
required for gl_spirv handling and tg4
Fixes: b77f43f2 ("zink: use ConstOffset for nir_tex_src_offset")
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required for gl_spirv handling and tg4
Fixes: b77f43f2 ("zink: use ConstOffset for nir_tex_src_offset")