qtbase: drop local backported patches

Those patches were backported and the changes are now
part of the latest Qt version.

Bug-AGL: SPEC-5069

Change-Id: Id82254c5f5ba01efe565b40c2f096d252f4c2c69
Signed-off-by: Denys Dmytriyenko <denys@konsulko.com>
Reviewed-on: https://gerrit.automotivelinux.org/gerrit/c/AGL/meta-agl/+/29718
ci-image-boot-test: Jenkins Job builder account
Tested-by: Jenkins Job builder account
ci-image-build: Jenkins Job builder account
Reviewed-by: Jan-Simon Moeller <jsmoeller@linuxfoundation.org>