arm64: dts: qcom: sc7280: Add a carveout for modem metadata

Add a new carveout for modem metadata on SC7280 SoCs.

Signed-off-by: Sibi Sankar <quic_sibis@quicinc.com>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20230117085840.32356-12-quic_sibis@quicinc.com