arm64: dts: qcom: sm8250: Add MDSS_CORE reset to mdss

arm64: dts: qcom: sm8250: Add MDSS_CORE reset to mdss

Like on other platforms, if the OS does not support recovering the state
left by the bootloader it needs access to MDSS_CORE, so that it can
clear the MDSS configuration. Add a reference to the relevant reset.

Signed-off-by: Luca Weiss <luca.weiss@fairphone.com>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
Tested-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com> # RB5
Link: https://lore.kernel.org/r/20250930-sm8250-mdss-reset-v1-1-a64522d91f12@fairphone.com
Signed-off-by: Bjorn Andersson <andersson@kernel.org>