default.xml: Bump pub/rockchip/meta-seco-rockchip revision

* e23ef05 : recipes-graphics: Add missing machine overrides - Natalia Kovalenko
* f935da2 : recipes-graphics: Delete xorg-xserver - Natalia Kovalenko

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