tgsi: (trivial) fix handling msaa resources on TXF
tgsi: (trivial) fix handling msaa resources on TXF

Just handle as ordinary 2d / 2d array resources. Prevents an assertion failure
with softpipe and piglit glsl-resource-not-bound 2DMS/2DMSArray tests.
While here also fix TXD shadowCube similarly, which fixes the crash with piglit
tex-miplevel-selection textureGrad CubeShadow (the test will still fail due to
softpipe being broken).

This fixes https://bugs.freedesktop.org/show_bug.cgi?id=80011

Reviewed-by: Jose Fonseca <61b5a29db2c0650f7c8510f93eece059c1b09320@vmware.com>

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