[IA64] Ski simulator doesn't need check_sal_cache_flush

Peter Chubb reported that commit 3463a93d
(Update check_sal_cache_flush to use platform_send_ipi()) broke
Ski because it does not implement IPIs.

Tony Luck suggested we just #ifndef out the call (since the simulator
does not have the SAL bug that this code is attempting to detect and
workaround)
Signed-off-by: NAlex Chiang <achiang@hp.com>
Signed-off-by: NTony Luck <tony.luck@intel.com>

arch/ia64/kernel/setup.c

@@ -616,7 +616,9 @@ setup_arch (char **cmdline_p)
 		ia64_mca_init();
 
 	platform_setup(cmdline_p);
+#ifndef CONFIG_IA64_HP_SIM
 	check_sal_cache_flush();
+#endif
 	paging_init();
 }