Add ingenic_tools/usbboot utility

This is essentially an expanded version of jz4760_tools/usbboot,
able to support both X1000 and JZ4760 CPUs and easily extended to
handle other Ingenic CPUs using the same boot protocol.

Change-Id: I70ce3acc3531d65390c6bbae4d2b3352140acf0a

utils/ingenic_tools/Makefile

@@ -0,0 +1,14 @@
+DEFINES=
+CC?=gcc
+CFLAGS=-g -std=c99 -Wall $(DEFINES) `pkg-config --cflags libusb-1.0`
+LDFLAGS=`pkg-config --libs libusb-1.0`
+SRC=$(wildcard *.c)
+EXEC=$(SRC:.c=)
+
+all: $(EXEC)
+
+%: %.c
+	$(CC) $(CFLAGS) -o $@ $< $(LDFLAGS)
+
+clean:
+	rm -fr $(EXEC)