mkimage: adding support for Davinci AIS image

Some Davinci processors supports the Application
Image Script (AIS) boot process. The patch adds the generation
of the AIS image inside the mkimage tool to make possible
to generate a bootable U-boot without external tools
(TI Davinci AIS Generator).

Signed-off-by: Stefano Babic <sbabic@denx.de>
CC: Wolfgang Denk <wd@denx.de>
diff --git a/tools/mkimage.h b/tools/mkimage.h
index 213baf0..5fe1a48 100644
--- a/tools/mkimage.h
+++ b/tools/mkimage.h
@@ -147,6 +147,7 @@
  *
  * Supported image types init functions
  */
+void init_ais_image_type(void);
 void init_kwb_image_type (void);
 void init_imx_image_type (void);
 void init_default_image_type (void);