xen/arm: domain_build: Always print the static shared memory region

xen/arm: domain_build: Always print the static shared memory region

At the moment, the information about allocating static shared memory
region is only printed during the debug build. This information can also
be helpful for the end user (which may not be the same as the person
building the package), so switch to printk(). Also drop XENLOG_INFO to be
consistent with other printk() used to print the domain information.

Signed-off-by: Michal Orzel <michal.orzel@amd.com>
Acked-by: Stefano Stabellini <sstabellini@kernel.org>
Release-acked-by: Henry Wang <Henry.Wang@arm.com>