Revert "xen/pv-on-hvm kexec: add xs_reset_watches to shutdown watches from old kernel"

Revert "xen/pv-on-hvm kexec: add xs_reset_watches to shutdown watches from old kernel"

This reverts commit ddacf5ef684a655abe2bb50c4b2a5b72ae0d5e05.

We piggyback on upstream git commit 12275dd4b747f5d87fa36229774d76bca8e63068
which says:

commit 12275dd4b747f5d87fa36229774d76bca8e63068
Author: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Date:   Mon Dec 19 09:30:35 2011 -0500

    Revert "xen/pv-on-hvm kexec: add xs_reset_watches to shutdown watches from old kernel"

    This reverts commit ddacf5ef684a655abe2bb50c4b2a5b72ae0d5e05.
    As when booting the kernel under Amazon EC2 as an HVM guest it ends up
    hanging during startup. Reverting this we loose the fix for kexec
    booting to the crash kernels.

    Fixes Canonical BZ #901305 (http://bugs.launchpad.net/bugs/901305)

    Tested-by: Alessandro Salvatori <sandr8@gmail.com>
    Reported-by:  Stefan Bader <stefan.bader@canonical.com>
    Acked-by: Ian Campbell <Ian.Campbell@citrix.com>
    Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>