hw/uefi: Create and use trace.h wrapper header

The documentation of the trace subsystem (docs/devel/tracing.rst)
says that each subdirectory which uses trace events should create a
wrapper trace.h file which includes the trace/trace-foo.h generated
header, and that .c files then #include "trace.h".

We didn't follow this pattern in hw/uefi/.  Correct this by creating
and using the trace.h wrapper header.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Michael Tokarev <mjt@tls.msk.ru>
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>

hw/uefi/trace.h

@@ -0,0 +1,2 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+#include "trace/trace-hw_uefi.h"

hw/uefi/var-service-core.c

@@ -12,7 +12,7 @@
 #include "hw/uefi/var-service-api.h"
 #include "hw/uefi/var-service-edk2.h"
 
-#include "trace/trace-hw_uefi.h"
+#include "trace.h"
 
 static int uefi_vars_pre_load(void *opaque)
 {

hw/uefi/var-service-policy.c

@@ -14,7 +14,7 @@
 #include "hw/uefi/var-service-api.h"
 #include "hw/uefi/var-service-edk2.h"
 
-#include "trace/trace-hw_uefi.h"
+#include "trace.h"
 
 static void calc_policy(uefi_var_policy *pol);
 

hw/uefi/var-service-utils.c

@@ -8,7 +8,7 @@
 
 #include "hw/uefi/var-service.h"
 
-#include "trace/trace-hw_uefi.h"
+#include "trace.h"
 
 /* ------------------------------------------------------------------ */
 

hw/uefi/var-service-vars.c

@@ -12,7 +12,7 @@
 #include "hw/uefi/var-service-api.h"
 #include "hw/uefi/var-service-edk2.h"
 
-#include "trace/trace-hw_uefi.h"
+#include "trace.h"
 
 #define EFI_VARIABLE_ATTRIBUTE_SUPPORTED                                \
     (EFI_VARIABLE_NON_VOLATILE |                                        \