Enables XSM functionality in builds that contain "xsm" in the PACKAGECONFIG.
Enables XSM functionality in builds that contain "xsm" in the PACKAGECONFIG.

* Correctly identifies xenpolicy by ${PV}
* Adds a check to identify if xsm is specified in PACKAGECONFIG and if so manually sets XSM_ENABLE in Xen's .config

Signed-off-by: Machon Gregory <deb8c2c6fa689556ec33e59e699bdd75d9afce09@tycho.nsa.gov>
Signed-off-by: Bruce Ashfield <9ae9c44b775ee9b29f4f502415e02e61a9b1a6a0@zedd.org>

cardoe/meta-virtualization,lgirdk/meta-virtualization,cjp256/meta-virtualization,lgirdk/meta-virtualization,cardoe/meta-virtualization,lgirdk/meta-virtualization,lgirdk/meta-virtualization,cjp256/meta-virtualization,lgirdk/meta-virtualization,cardoe/meta-virtualization,cjp256/meta-virtualization