i965: Don't forget the cube map padding on gen5+.
i965: Don't forget the cube map padding on gen5+.

We had a fixup for gen4's 3d-layout cubemaps (which, iirc, we'd
experimentally found to be necessary!), but while the spec still requires
it on gen5, we'd been missing it in the array-layout cubemaps.

Cc: "9.1 9.2" <59f39c0db42d4479a46b02d4d2bc11120e37bb44@lists.freedesktop.org>
Reviewed-by: Ian Romanick <2b237cafb16dc45038e85df6c85e74e6d899eba9@intel.com>
Reviewed-by: Chad Versace <a557f7f75bf28dc19ac99107f5cc7cd6b3fbdb1a@linux.intel.com>
Reviewed-by: Kenneth Graunke <bd2562f754ec92342f93f61c25d731e290a2ffa8@whitecape.org>

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