dt-bindings: timer: sifive,clint: add comaptibles for T-Head's C9xx
T-Head C906/C910 CLINT is not compliant to SiFive ones (and even not compliant to the newcoming ACLINT spec) because of lack of mtime register. Add a compatible string formatted like the C9xx-specific PLIC compatible, and do not allow a SiFive one as fallback because they're not really compliant. Signed-off-by: Icenowy Zheng <uwu@icenowy.me> Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org> Reviewed-by: Samuel Holland <samuel@sholland.org> Acked-by: Conor Dooley <conor.dooley@microchip.com> Link: https://lore.kernel.org/r/20230202072814.319903-1-uwu@icenowy.meSigned-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
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