vl: Don't use CS compositer when TEX_LZ or DIV are not supported by the driver

In addition, replace a simple DIV+ADD by using MAD and the reciprocal value of the constant inputs.

This is a quick fix for Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=110783

Remark: IMHO a better option would be to get rid of the DIVs by using the reciprocal value of the constants, but to get a fix out quickly this MR should do.