Revert "x86: disable IOMMUs on kernel crash"

This effectively reverts commit 61d047b.

Disabling the IOMMU can potetially allow DMA transactions to
complete without being translated.  Leave it enabled, and allow
crash kernel to do the IOMMU reinitialization properly.

Cc: [email protected]
Cc: Joerg Roedel <[email protected]>
Cc: Eric Biederman <[email protected]>
Cc: Neil Horman <[email protected]>
Cc: Vivek Goyal <[email protected]>
Signed-off-by: Chris Wright <[email protected]>
Signed-off-by: Joerg Roedel <[email protected]>

arch/x86/kernel/crash.c

@@ -27,7 +27,6 @@
 #include <asm/cpu.h>
 #include <asm/reboot.h>
 #include <asm/virtext.h>
-#include <asm/x86_init.h>
 
 #if defined(CONFIG_SMP) && defined(CONFIG_X86_LOCAL_APIC)
 
@@ -103,10 +102,5 @@ void native_machine_crash_shutdown(struct pt_regs *regs)
 #ifdef CONFIG_HPET_TIMER
 	hpet_disable();
 #endif
-
-#ifdef CONFIG_X86_64
-	x86_platform.iommu_shutdown();
-#endif
-
 	crash_save_cpu(regs, safe_smp_processor_id());
 }