drm/amd/pm: change pmfw_decoded_link_width, speed variables to globals

gcc with W=1 reports
In file included from drivers/gpu/drm/amd/amdgpu/../pm/swsmu/smu13/smu_v13_0.c:36:
./drivers/gpu/drm/amd/amdgpu/../pm/swsmu/inc/smu_v13_0.h:66:18: error:
  ‘pmfw_decoded_link_width’ defined but not used [-Werror=unused-const-variable=]
   66 | static const int pmfw_decoded_link_width[7] = {0, 1, 2, 4, 8, 12, 16};
      |                  ^~~~~~~~~~~~~~~~~~~~~~~
./drivers/gpu/drm/amd/amdgpu/../pm/swsmu/inc/smu_v13_0.h:65:18: error:
  ‘pmfw_decoded_link_speed’ defined but not used [-Werror=unused-const-variable=]
   65 | static const int pmfw_decoded_link_speed[5] = {1, 2, 3, 4, 5};
      |                  ^~~~~~~~~~~~~~~~~~~~~~~

These variables are defined and used in smu_v13_0_7_ppt.c and smu_v13_0_0_ppt.c.
There should be only one definition.  So define the variables as globals
in smu_v13_0.c

Signed-off-by: Tom Rix <trix@redhat.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/pm/swsmu/inc/smu_v13_0.h

@@ -62,8 +62,8 @@
 #define CTF_OFFSET_HOTSPOT		5
 #define CTF_OFFSET_MEM			5
 
-static const int pmfw_decoded_link_speed[5] = {1, 2, 3, 4, 5};
-static const int pmfw_decoded_link_width[7] = {0, 1, 2, 4, 8, 12, 16};
+extern const int pmfw_decoded_link_speed[5];
+extern const int pmfw_decoded_link_width[7];
 
 #define DECODE_GEN_SPEED(gen_speed_idx)		(pmfw_decoded_link_speed[gen_speed_idx])
 #define DECODE_LANE_WIDTH(lane_width_idx)	(pmfw_decoded_link_width[lane_width_idx])

drivers/gpu/drm/amd/pm/swsmu/smu13/smu_v13_0.c

@@ -85,6 +85,9 @@ MODULE_FIRMWARE("amdgpu/smu_13_0_10.bin");
 static const int link_width[] = {0, 1, 2, 4, 8, 12, 16};
 static const int link_speed[] = {25, 50, 80, 160};
 
+const int pmfw_decoded_link_speed[5] = {1, 2, 3, 4, 5};
+const int pmfw_decoded_link_width[7] = {0, 1, 2, 4, 8, 12, 16};
+
 int smu_v13_0_init_microcode(struct smu_context *smu)
 {
 	struct amdgpu_device *adev = smu->adev;