dt-bindings: firmware: tegra186-bpmp: Remove name property

This property is not used by device trees and was likely supposed to be
a hint as to what the BPMP node should be named, rather than describing
a property of the BPMP node.
Suggested-by: Jon Hunter <jonathanh@nvidia.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>

Documentation/devicetree/bindings/firmware/nvidia,tegra186-bpmp.txt

@@ -8,7 +8,6 @@ which can create the interprocessor communication (IPC) between the CPU
 and BPMP.
 
 Required properties:
-- name : Should be bpmp
 - compatible
     Array of strings
     One of: