default.xml: Bump meta-arm revision

* db6e0ed : arm/oeqa: Use linuxboot and OEFVPSerialTarget instead of noop - Peter Hoyes
* 72a3dfa : arm/oeqa: Create new OEFVPSerialTarget with pexpect interface - Peter Hoyes
* 3ead3aa : arm/classes: Change FVP_CONSOLE to FVP_CONSOLES in fvpconf - Peter Hoyes
* ae48e65 : arm/oeqa: Refactor OEFVPTarget to use FVPRunner and pexpect - Peter Hoyes
* fb794c8 : arm/oeqa: Add selftests for FVP library - Peter Hoyes
* d2685ae : scripts,arm/lib: Refactor runfvp into FVPRunner - Peter Hoyes
* 528d28f : runfvp: ignore setpgid errors when spawned - Bertrand Marquis

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