ARM: dts: Add missing address/size-cells properties for Trats board

ARM: dts: Add missing address/size-cells properties for Trats board

Fixes compilation warning:

  DTC     arch/arm/boot/dts/exynos4210-trats.dtb
Warning (reg_format): "reg" property in /dsi@11C80000/panel@0 has invalid length (4 bytes) (#address-cells == 2, #size-cells == 1)
Warning (avoid_default_addr_size): Relying on default #address-cells value for /dsi@11C80000/panel@0
Warning (avoid_default_addr_size): Relying on default #size-cells value for /dsi@11C80000/panel@0

Change-Id: Ib1ec361d058fa89dda4391ca49015bdd8fb5185c
Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>