Separate target-building make targets from image-building make targets

Currently, it's not possible to have dependencies from an image-building
target to a rootfs-building target.

For example, the boot-wrapper-aarch64 package uses the kernel build as
an input file. It supplies a dependency on 'linux', but this will break
if we're using BR2_TARGET_ROOTFS_INITRAMFS - the wrapper will include
the first kernel build, not the rebuild (which contains the embedded
initramfs).

This means we'd need to express a dependency from the target build to
the image build. However, if we do something like:

-BOOT_WRAPPER_AARCH64_DEPENDENCIES   = linux
+BOOT_WRAPPER_AARCH64_DEPENDENCIES   = linux26-rebuild-with-initramfs

- then we get a circular dependency, because boot-wrapper-aarch64 is in
the TARGETS list, which linux26-rebuild-with-initramfs depends on.

This change splits the possible targets into two separate lists,
TARGET_TARGETS (dependencies for building the target dir) and
IMAGE_TARGETS (dependencies for building images). We keep TARGETS as a
list of everything, and use TARGET_TARGETS for the rootfs-finalize
target.

Signed-off-by: Jeremy Kerr <jk@ozlabs.org>
Signed-off-by: Stewart Smith <stewart@linux.vnet.ibm.com>
Signed-off-by: Joel Stanley <joel@jms.id.au>

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