nv50: fix 2d engine blits for 64- and 128-bit formats
nv50: fix 2d engine blits for 64- and 128-bit formats

This fixes bin/ext_framebuffer_multisample-formats all_samples

Signed-off-by: Ilia Mirkin <bcbbb7aa705ec3a5fc5824c01a845186c3d62fca@alum.mit.edu>
Cc: "11.0" <59f39c0db42d4479a46b02d4d2bc11120e37bb44@lists.freedesktop.org>

metora/MesaGLSLCompiler,metora/MesaGLSLCompiler,metora/MesaGLSLCompiler