drm/radeon: change cac_weights_* to static

Sparse reports these issues
si_dpm.c:332:26: warning: symbol 'cac_weights_pitcairn' was not declared. Should it be static?
si_dpm.c:1088:26: warning: symbol 'cac_weights_oland' was not declared. Should it be static?

Both of these variables are only used in si_dpm.c.  Single file variables
should be static, so change their storage-class specifiers to static.
Signed-off-by: Tom Rix <trix@redhat.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/radeon/si_dpm.c

@@ -329,7 +329,7 @@ static const struct si_dte_data dte_data_malta =
 	true
 };
 
-struct si_cac_config_reg cac_weights_pitcairn[] =
+static struct si_cac_config_reg cac_weights_pitcairn[] =
 {
 	{ 0x0, 0x0000ffff, 0, 0x8a, SISLANDS_CACCONFIG_CGIND },
 	{ 0x0, 0xffff0000, 16, 0x0, SISLANDS_CACCONFIG_CGIND },
@@ -1085,7 +1085,7 @@ static const struct si_dte_data dte_data_venus_pro =
 	true
 };
 
-struct si_cac_config_reg cac_weights_oland[] =
+static struct si_cac_config_reg cac_weights_oland[] =
 {
 	{ 0x0, 0x0000ffff, 0, 0x82, SISLANDS_CACCONFIG_CGIND },
 	{ 0x0, 0xffff0000, 16, 0x4F, SISLANDS_CACCONFIG_CGIND },