[PATCH] ehea: add kexec support

[Jeff Garzik]

Jan-Bernd Themann wrote:
> eHEA resources that are allocated via H_CALLs have a unique identifier each.
> These identifiers are necessary to free the resources. A reboot notifier
> is used to free all eHEA resources before the indentifiers get lost, i.e
> before kexec starts a new kernel.
> 
> Signed-off-by: Jan-Bernd Themann <themann at de.ibm.com>

applied to #upstream-fixes