dt-bindings: exynos5433-decon: add TE interrupt binding

DECON command mode can use hardware trigger where transmission
is triggered automatically, or software trigger - where TE interrupt
handler should trigger transmission.
DECON will use software trigger if TE interrupt is specified.
Signed-off-by: NAndrzej Hajda <a.hajda@samsung.com>
Signed-off-by: NInki Dae <inki.dae@samsung.com>

Documentation/devicetree/bindings/display/exynos/exynos5433-decon.txt

@@ -10,7 +10,8 @@ Required properties:
 - reg: physical base address and length of the DECON registers set.
 - interrupt-names: should contain the interrupt names depending on mode of work:
 		video mode: "vsync",
-		command mode: "lcd_sys".
+		command mode: "lcd_sys",
+		command mode with software trigger: "lcd_sys", "te".
 - interrupts or interrupts-extended: list of interrupt specifiers corresponding
 		to names privided in interrupt-names, as described in
 		interrupt-controller/interrupts.txt