Add platform device data for the SA11x0 MCP device.  This allows
platforms to customise the configuration of the SA11x0 MCP device
according to their needs.
Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>

This adds support for the MCP interface found on SA11x0 devices.
Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>