meta-ti-bsp: don't apply mesa virgl patch for TI pvr graphics

meta-ti-bsp: don't apply mesa virgl patch for TI pvr graphics

Latest TI graphics now uses Mesa, but it uses a slightly newer and
patched version of Mesa for SGX and Rogue GPUs. Since generic mesa
virgl patch from meta-agl-bsp/core already exists in that version
of Mesa, need to skip applying it here.

Bug-AGL: SPEC-4723

Change-Id: I795e2bf41bea8305be25418de7cc3262aefb3b4a
Signed-off-by: Denys Dmytriyenko <denys@konsulko.com>
Reviewed-on: https://gerrit.automotivelinux.org/gerrit/c/AGL/meta-agl/+/28742
ci-image-build: Jenkins Job builder account
ci-image-boot-test: Jenkins Job builder account
Tested-by: Jan-Simon Moeller <jsmoeller@linuxfoundation.org>
Reviewed-by: Jan-Simon Moeller <jsmoeller@linuxfoundation.org>