dt-bindings: clock: dispcc-qcm2290: Add MDSS_CORE reset

Add the MDSS_CORE reset which can be asserted to reset the state of
the entire MDSS.

Signed-off-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20230316-topic-qcm_dispcc_reset-v1-1-dd3708853014@linaro.org