meta-ti-bsp: mesa: drop unneeded bbappend

meta-ti-bsp: mesa: drop unneeded bbappend

Latest TI graphics libraries for SGX and Rogue GPUs no longer include
Mesa pieces, but rather build on top of proper Mesa packages (although
patched). Remove local bbappend disabling GBM.

Bug-AGL: SPEC-4723

Change-Id: I8a4ba82d0e7540d6fe2da7efdcefab7a2dc77c6b
Signed-off-by: Denys Dmytriyenko <denys@konsulko.com>
Reviewed-on: https://gerrit.automotivelinux.org/gerrit/c/AGL/meta-agl/+/28739
Tested-by: Jenkins Job builder account
ci-image-build: Jenkins Job builder account
ci-image-boot-test: Jenkins Job builder account
Reviewed-by: Jan-Simon Moeller <jsmoeller@linuxfoundation.org>