default.xml: Update source revision on meta-seco-rockchip

This revision fixes QA test build issue for lte-modem, deletes outdated
patch from rockchip-libmali, fixes do_deploy task in u-boot-seco for
file uEnvD23.txt to be accessible duiring deploy_boot_artifacts_to_rootfs

Signed-off-by: Natalia Kovalenko <waykovalenko@gmail.com>