meta-agl-bsp: remove redundant abseil-cpp patches

meta-agl-bsp: remove redundant abseil-cpp patches

Remove local patches for abseil-cpp and python3-grpcio (which has a
vendored abseil-cpp) that were to fix a runtime crash on RISC-V
plaforms.  The patches have been merged into the recipes in upstream
meta-oe and meta-python, so are no longer required with the latest
bump of those layers.

Bug-AGL: SPEC-5212

Change-Id: I863b4a7c32697c42e967f3cc0cfb1c7f98604e5a
Signed-off-by: Scott Murray <scott.murray@konsulko.com>
Reviewed-on: https://gerrit.automotivelinux.org/gerrit/c/AGL/meta-agl/+/30115
Reviewed-by: Jan-Simon Moeller <jsmoeller@linuxfoundation.org>
ci-image-build: Jenkins Job builder account
Tested-by: Jenkins Job builder account
ci-image-boot-test: Jenkins Job builder account
(cherry picked from commit 6aee7cff29c9ee1b4122736c86e2569ffcf41a33)
Reviewed-on: https://gerrit.automotivelinux.org/gerrit/c/AGL/meta-agl/+/30127