kernel.bbclass: Correct post(inst|rm) package association
Fixes [YOCTO #4991]
The kernel image is installed as part of the kernel-image package, but
the symlink creation/removal via alternatives is being done in
pkg_post(inst|rm)_kernel-base.
Move the postinst alternatives logic into the kernel-image functions.
(From OE-Core rev:
35f538b117e3387354d2dab1f22c3de28ab1322b)
Signed-off-by: Darren Hart <dvhart@linux.intel.com>
Signed-off-by: Saul Wold <sgw@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
