iommu/vt-d: Fix compile error [-Werror=implicit-function-declaration]

trace_qi_submit() could be used when interrupt remapping is supported,
but DMA remapping is not. In this case, the following compile error
occurs.

../drivers/iommu/intel/dmar.c: In function 'qi_submit_sync':
../drivers/iommu/intel/dmar.c:1311:3: error: implicit declaration of function 'trace_qi_submit';
  did you mean 'ftrace_nmi_exit'? [-Werror=implicit-function-declaration]
   trace_qi_submit(iommu, desc[i].qw0, desc[i].qw1,
   ^~~~~~~~~~~~~~~
   ftrace_nmi_exit

Fixes: f2dd8717 ("iommu/vt-d: Add qi_submit trace event")
Reported-by: kernel test robot <lkp@intel.com>
Reported-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Link: https://lore.kernel.org/r/20210130151907.3929148-1-baolu.lu@linux.intel.comSigned-off-by: Joerg Roedel <jroedel@suse.de>

drivers/iommu/intel/Makefile

 # SPDX-License-Identifier: GPL-2.0
 obj-$(CONFIG_DMAR_TABLE) += dmar.o
 obj-$(CONFIG_INTEL_IOMMU) += iommu.o pasid.o
-obj-$(CONFIG_INTEL_IOMMU) += trace.o
+obj-$(CONFIG_DMAR_TABLE) += trace.o
 obj-$(CONFIG_INTEL_IOMMU_DEBUGFS) += debugfs.o
 obj-$(CONFIG_INTEL_IOMMU_SVM) += svm.o
 obj-$(CONFIG_IRQ_REMAP) += irq_remapping.o

drivers/iommu/intel/iommu.c

@@ -44,7 +44,6 @@
 #include <asm/irq_remapping.h>
 #include <asm/cacheflush.h>
 #include <asm/iommu.h>
-#include <trace/events/intel_iommu.h>
 
 #include "../irq_remapping.h"
 #include "pasid.h"

include/trace/events/intel_iommu.h

@@ -6,7 +6,6 @@
  *
  * Author: Lu Baolu <baolu.lu@linux.intel.com>
  */
-#ifdef CONFIG_INTEL_IOMMU
 #undef TRACE_SYSTEM
 #define TRACE_SYSTEM intel_iommu
 
@@ -176,4 +175,3 @@ TRACE_EVENT(qi_submit,
 
 /* This part must be outside protection */
 #include <trace/define_trace.h>
-#endif /* CONFIG_INTEL_IOMMU */