default.xml: Bump meta-arm revision

* ci: work around zephyr test issues : Jon Mason
* arm-bsp/fvp-baser-aemv8r64: Use secure hypervisor physical timer in EL2 : Jiamei Xie
* arm/fvp-base-r-aem: Upgrade to version 11.18.16 : Peter Hoyes

Signed-off-by: Pavel Zhukov <pavel.zhukov@huawei.com>