[PATCH] export flush_tlb_all for drm modules

From: Jan Dittmer <j.dittmer@portrix.net>

This adds an export for flush_tlb_all to i386_ksyms.c.  The drm modules
miss this, when compiling for SMP.

I changed Jan's patch to use EXPORT_SYMBOL_GPL.

arch/i386/kernel/i386_ksyms.c

@@ -159,6 +159,7 @@ EXPORT_SYMBOL(smp_call_function);
 
 /* TLB flushing */
 EXPORT_SYMBOL(flush_tlb_page);
+EXPORT_SYMBOL_GPL(flush_tlb_all);
 #endif
 
 #ifdef CONFIG_X86_IO_APIC