[stm32f429i-discovery] Added LTDC DMA example.

This example is just using buffers and built in alpha overlay
functionality to animate a dmond floating on a checker board. After
initializing of the frame buffers only 7 registers are being modified to
implement the animation.

examples/stm32/f4/stm32f429i-discovery/lcd-dma/Makefile

@@ -0,0 +1,10 @@
+OBJS = sdram.o clock.o console.o lcd-spi.o
+
+BINARY = lcd-dma
+
+# we use sin/cos from the library
+LDLIBS += -lm
+
+LDSCRIPT = ../stm32f429i-discovery.ld
+
+include ../../Makefile.include