kernel: Copy over bzImage to sysroots during install

Fixes [Yocto #987]

The following commit introduced a build failure:

Commit 3b49416fc7
Author: Darren Hart <dvhart@linux.intel.com>
Date:   Tue Mar 8 17:09:10 2011 -0800
kernel/bbclass: rework kernel and module classes to allow for building
out-of-tree modules

Resulting in:
| install: cannot stat
`/usr/local/test/intel-bsp/build/tmp/sysroots/n450/kernel/bzImage': No such
file or directory
| ERROR: Function 'build_boot_bin' failed (see
/usr/local/test/intel-bsp/build/tmp/work/core2-poky-linux/poky-image-minimal-live-1.0-r0/temp/log.do_bootimg.1106
for further information)

The bzImage file was not being copied to sysroot, correct that.

(From OE-Core rev: 65cb39826370d3e35229bcc5fe0c8da8b2ab409b)

Signed-off-by: Darren Hart <dvhart@linux.intel.com>
Cc: Tom Zanussi <tom.zanussi@intel.com>
Cc: Bruce Ashfield <bruce.ashfield@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/classes/kernel.bbclass

@@ -136,6 +136,7 @@ kernel_do_install() {
 	if [ ! "${S}" == "${B}" ]; then
 		cp -fR ${S}/* $kerneldir
 	fi
+	install -m 0644 ${KERNEL_OUTPUT} $kerneldir/${KERNEL_IMAGETYPE}
 	echo "LINUX BUILD TREE COPIED TO SYSROOTS"
 	du -hs $kerneldir