turnip: Implement VK_EXT_non_seamless_cube_map
An implementation of VK_EXT_non_seamless_cube_map, targeted to address #7048.
Passes CTS tests: dEQP-VK.texture.*non_seamless_*
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An implementation of VK_EXT_non_seamless_cube_map, targeted to address #7048.
Passes CTS tests: dEQP-VK.texture.*non_seamless_*