lpc32xx: add lpc32xx-spl.bin boot image target

Signed-off-by: Albert ARIBAUD (3ADEV) <albert.aribaud@3adev.fr>
diff --git a/tools/Makefile b/tools/Makefile
index 88770b0..4bbb153 100644
--- a/tools/Makefile
+++ b/tools/Makefile
@@ -83,6 +83,7 @@
 			imximage.o \
 			kwbimage.o \
 			lib/md5.o \
+			lpc32xximage.o \
 			mxsimage.o \
 			omapimage.o \
 			os_support.o \