dt-bindings: mailbox: qcom-ipcc: Document the Eliza Inter-Processor Communication...

dt-bindings: mailbox: qcom-ipcc: Document the Eliza Inter-Processor Communication Controller

Document the Inter-Processor Communication Controller (IPCC) found in the
Qualcomm Eliza SoC. It is used to route interrupts across various
subsystems.

Signed-off-by: Abel Vesa <abel.vesa@oss.qualcomm.com>
Acked-by: Manivannan Sadhasivam <mani@kernel.org>
Reviewed-by: Konrad Dybcio <konrad.dybcio@oss.qualcomm.com>
Signed-off-by: Jassi Brar <jassisinghbrar@gmail.com>