ARM: dts: iwg22d: Add /dev/ttySC5 support

Add support for HSCIF1 as /dev/ttySC5, keeping the same naming
scheme adopted by iWave in their BSP release. This interface
uses RTS/CTS.

Signed-off-by: Fabrizio Castro <fabrizio.castro@bp.renesas.com>
Signed-off-by: Chris Paterson <chris.paterson2@renesas.com>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>