ARM: pxa: magician: Remove definition of the STUART port

Magician STUART port is connected to the infraport and used by the FICP
driver. The FICP driver uses its own definition.

Required for correct initialization of the pxaficp_ir driver after
planned dmaengine conversion.

Signed-off-by: Petr Cvek <petr.cvek@tul.cz>
Signed-off-by: Robert Jarzmik <robert.jarzmik@free.fr>