drm/aspeed: Look up syscon by phandle
This scales better to multiple families of SoC. The lookup by compatible can be removed in a future change. The fallback path is for the ast2500 platform only. Other platforms will be added with the new style, so they won't need fallback paths. Signed-off-by:Joel Stanley <joel@jms.id.au> Reviewed-by:
Andrew Jeffery <andrew@aj.id.au> Link: https://patchwork.freedesktop.org/patch/msgid/20210209123734.130483-2-joel@jms.id.au
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