etnaviv: remove number of pixel pipes validation
etnaviv: remove number of pixel pipes validation

This validation was added before the etnaviv drm driver landed in
the linux kernel. Due some pre-merge API changes we had to fix-up
this value but with a mainline kernel this is not a problem anymore.

Lets remove that validation which also gets rid of problem caught
by Coverity, reported to me by imirkin.

Cc: "17.0" <59f39c0db42d4479a46b02d4d2bc11120e37bb44@lists.freedesktop.org>
Signed-off-by: Christian Gmeiner <7d98dcb0e8545320ffc03d45630c91ed21ec4c41@gmail.com>
Reviewed-by: Eric Engestrom <de0b63cf2dfb1fae8ed3c3b4244856a05677d4f0@imgtec.com>

metora/MesaGLSLCompiler,metora/MesaGLSLCompiler,metora/MesaGLSLCompiler