x86/shadow: exclude HVM-only code from sh_remove_shadows() when !HVM

In my (debug) build this amounts to well over 500 bytes of dead code.

Signed-off-by: Jan Beulich <jbeulich@suse.com>
Acked-by: Andrew Cooper <andrew.cooper3@citrix.com>

xen/arch/x86/mm/shadow/common.c

@@ -2240,10 +2240,12 @@ void sh_remove_shadows(struct domain *d, mfn_t gmfn, int fast, int all)
     }                                                                   \
 } while (0)
 
+#ifdef CONFIG_HVM
     DO_UNSHADOW(SH_type_l2_32_shadow);
     DO_UNSHADOW(SH_type_l1_32_shadow);
     DO_UNSHADOW(SH_type_l2_pae_shadow);
     DO_UNSHADOW(SH_type_l1_pae_shadow);
+#endif
     DO_UNSHADOW(SH_type_l4_64_shadow);
     DO_UNSHADOW(SH_type_l3_64_shadow);
     DO_UNSHADOW(SH_type_l2h_64_shadow);