image.bbclass: deltask do_packagedata

This can fix a do_package error when compile with meta-secure-core layer:
http://layers.openembedded.org/layerindex/branch/master/layer/meta-secure-core/



$ bitbake kernel-initramfs
[snip]
WARNING:kernel-initramfs-1.0-r0 do_package: Manifest
build/tmp-glibc/sstate-control/manifest-x86_64_x86_64-nativesdk-secure-core-image-initramfs.packagedata
not found in intel_x86_64 corei7-64 core2-64 x86_64 allarch x86_64_x86_64-nativesdk (variant '')?
[snip]

This is because kernel-initramfs wants to pack an initramfs image into
kernel-initramfs.rpm which adds a dependency in kernel-initramfs.bb to do this:

d.appendVarFlag('do_install', 'depends', ' ${INITRAMFS_IMAGE}:do_image_complete')

This causes kernel-initramfs' do_package depends on
${INITRAMFS_IMAGE}:do_image_complete's do_packagedata, then we will get the
error. Delete do_packagedata as other do_package relelated tasks for the image
recipe will fix the error.

RP: There is a side effect from this change which means that image
tasks will no longer run their fetch/unpack/configure/compile/install
tasks as these become detached from the dependency chain. The standard
tasks are noexec or deleted anyway already so this shouldn't be a
significant change.

Signed-off-by: Robert Yang <liezhi.yang@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>