arm64: config: add Phytium Drm config

phytium inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I8KIG5


CVE: NA

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Add Phytium DRM driver config into openeuler_defconfig.

Signed-off-by: Jiakun Shuai <shuaijiakun1288@phytium.com.cn>