drm/amdgpu: make arrays pctl0_data and pctl1_data static

The arrays pctl0_data and pctl1_data do not need to be in global scope,
so them both static.

Cleans up sparse warnings:
symbol 'pctl0_data' was not declared. Should it be static?
symbol 'pctl1_data' was not declared. Should it be static?
Signed-off-by: NColin Ian King <colin.king@canonical.com>
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/mmhub_v1_0.c

@@ -249,7 +249,7 @@ struct pctl_data {
 	uint32_t data;
 };
 
-const struct pctl_data pctl0_data[] = {
+static const struct pctl_data pctl0_data[] = {
 	{0x0, 0x7a640},
 	{0x9, 0x2a64a},
 	{0xd, 0x2a680},
@@ -274,7 +274,7 @@ const struct pctl_data pctl0_data[] = {
 #define PCTL0_STCTRL_REG_SAVE_RANGE0_BASE  0xa640
 #define PCTL0_STCTRL_REG_SAVE_RANGE0_LIMIT 0xa833
 
-const struct pctl_data pctl1_data[] = {
+static const struct pctl_data pctl1_data[] = {
 	{0x0, 0x39a000},
 	{0x3b, 0x44a040},
 	{0x81, 0x2a08d},