ShellPkg/Library: Fix 32-bit truncation of pointer values

REF: https://bugzilla.tianocore.org/show_bug.cgi?id=4366



Update C and UNI files that are incorrectly using %x or %08x
instead of %p for pointer values.  On 64-bit systems, this is
truncating pointer values above 4GB.

In reviewing ShellPkg for this issue some unused UNI strings
with incorrect format specifiers were removed instead of being
fixed.

Cc: Ray Ni <ray.ni@intel.com>
Cc: Zhichao Gao <zhichao.gao@intel.com>
Signed-off-by: Michael D Kinney <michael.d.kinney@intel.com>
Reviewed-by: Ray Ni <ray.ni@intel.com>