nir/linker: use only the array element type for array of ssbo/ubo

nir/linker: use only the array element type for array of ssbo/ubo

For this interfaces, the inner members are added only once as uniforms
or resources, in opposite to other cases, like a uniform array of
structs.

For those guessing why a issue (16) from ARB_program_interface_query
was used, instead of a quote of the core spec: The core spec is not
really clear about how members of arrays of blocks should be
enumerated.

On GLSL this was also problematic, specially when we were trying to
pass the 4.5 CTS tests. See commit "glsl: Fix program interface
queries relating to interface blocks"
(4c4d9e4f032d5753034361ee70aa88d16d3a04b4), as a reference. That one
also needed to rely on issue (16) to justify the change, pointing that
the core spec needs to be clarified.

Reviewed-by: Timothy Arceri <tarceri@itsqueeze.com>