documentation/kernel-manual: removed a figure and updated makefile

I removed the figures/kernel-big-picture.png file as it is not used
in the manual.  I also had to update the Makefile so that it would
not include this PNG file in the tarball.

(From yocto-docs rev: 461ab9525d16dbbdf5f5c56c16028cae911309b9)

Signed-off-by: Scott Rifenbark <scott.m.rifenbark@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

documentation/kernel-manual/Makefile

@@ -21,7 +21,7 @@ html:
 	xsltproc $(XSLTOPTS) -o kernel-manual.html yocto-project-kernel-manual-customization.xsl kernel-manual.xml
 
 tarball: html
-	tar -cvzf kernel-manual.tgz kernel-manual.html kernel-manual.pdf style.css figures/kernel-title.png figures/kernel-big-picture.png figures/kernel-architecture-overview.png
+	tar -cvzf kernel-manual.tgz kernel-manual.html kernel-manual.pdf style.css figures/kernel-title.png figures/kernel-architecture-overview.png
 
 validate:
 	xmllint --postvalid --xinclude --noout kernel-manual.xml