etnaviv: Fully replicate back stencil config

The blob replicates both the value mask as well as the stencil reference
of the back-facing stencil to the front-facing stencil. This fixes the
remaining failures in the following dEQPs:

   dEQP-GLES2.functional.fbo.render.*_stencil_index8

Fixes: c8ccd639 ("etnaviv: Fix depth stencil ops on GC880/GC2000")
Signed-off-by: Marek Vasut <marex@denx.de>
23 jobs for !4867 with stm32-backstencil
latest detached
Status Job ID Name Coverage
  Container
manual arm_build #2543595
aarch64 manual
manual arm_test #2543596
aarch64 manual
manual windows_build_vs2019 #2543597
windows shell 1809 mesa manual
manual x86_build #2543591
manual
manual x86_build_old #2543594
manual
manual x86_test-gl #2543592
manual
manual x86_test-vk #2543593
manual
 
  Meson X86 64
created meson-clang #2543601
created meson-classic #2543600
created meson-clover #2543602
created meson-clover-old-llvm #2543603
created meson-gallium #2543599
created meson-testing #2543598
created meson-vulkan #2543604
 
  Scons
created scons-win64 #2543605
allowed to fail
 
  Meson Misc
created meson-arm64 #2543607
aarch64
created meson-arm64-build-test #2543608
aarch64
created meson-armhf #2543606
aarch64
created meson-i386 #2543610
created meson-mingw32-x86_64 #2543613
created meson-ppc64el #2543612
kvm
created meson-s390x #2543611
kvm
created meson-windows-vs2019 #2543609
windows docker 1809 mesa