arm64: dts: qcom: sdm845: Add a carveout for modem metadata

Add a new carveout for modem metadata on SDM845 SoCs.

Tested-by: Amit Pundir <amit.pundir@linaro.org>
Signed-off-by: Sibi Sankar <quic_sibis@quicinc.com>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20230117085840.32356-10-quic_sibis@quicinc.com