dt-bindings: arm: qcom: Document Xiaomi Poco F1 Tianma variant

Document the panel-specific compatible string for the Tianma variant
of the Xiaomi Poco F1:

  - "xiaomi,beryllium-tianma"

and require the generic fallback compatible:

  - "xiaomi,beryllium"

Update the binding to clarify that all panel variants must list the
variant-specific compatible first, followed by the generic device
compatible, in accordance with DT matching rules.

The previous binding documentation did not describe the Tianma variant
and did not clearly specify the required fallback compatible, which
resulted in inconsistent DTS implementations.

No functional differences are currently exposed between Tianma and EBBG
variants at the binding level; both rely on the same generic device
compatibility for software support.

Signed-off-by: David Heidelberg <david@ixit.cz>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@oss.qualcomm.com>
Link: https://lore.kernel.org/r/20260405-beryllium-compat-string-v2-1-91149be07835@ixit.cz
Signed-off-by: Bjorn Andersson <andersson@kernel.org>

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