ARM: mach-shmobile: add LCDC and MIPI DSI-Tx clock definitions to sh7372

Define clock objects for switching on and off clocks for LCDC0, LCDC1 and MIPI
DSI-Tx.

Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>