ARM: at91/dt: add LCD to at91sam9x5 and EK boards

Add the SAM9X5-DM LCD support to dtsi/dts files as well as the needed
information that are stored directly in board-dt-sam9.c file.

Signed-off-by: Swapna Gurumani <swapna.gurumani@atmel.com>
[nicolas.ferre@atmel.com: extended to all SoC of the family]
Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Merge branch 'at91-3.10-trunk/v3.10_lcd' into linux-3.10-at91