drm/amdgpu: Fix unused amdgpu_acpi_get_numa_info function in amdgpu_acpi_get_node_id()

Fix the below compiler complaining error:

drivers/gpu/drm/amd/amdgpu/amdgpu_acpi.c:860:33: error: unused function 'amdgpu_acpi_get_numa_info' [-Werror,-Wunused-function]
static struct amdgpu_numa_info *amdgpu_acpi_get_numa_info(uint32_t pxm)
                                ^
1 error generated.

By guarding amdgpu_acpi_get_numa_info & amdgpu_acpi_get_numa_size
function, only when CONFIG_ACPI_NUMA is enabled.
Suggested-by: Lijo Lazar <lijo.lazar@amd.com>
Cc: Christian König <christian.koenig@amd.com>
Cc: Lijo Lazar <lijo.lazar@amd.com>
Cc: Luben Tuikov <luben.tuikov@amd.com>
Cc: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Srinivasan Shanmugam <srinivasan.shanmugam@amd.com>
Reviewed-by: Lijo Lazar <lijo.lazar@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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

@@ -841,6 +841,7 @@ int amdgpu_acpi_smart_shift_update(struct drm_device *dev, enum amdgpu_ss ss_sta
 	return r;
 }
 
+#ifdef CONFIG_ACPI_NUMA
 static inline uint64_t amdgpu_acpi_get_numa_size(int nid)
 {
 	/* This is directly using si_meminfo_node implementation as the
@@ -886,6 +887,7 @@ static struct amdgpu_numa_info *amdgpu_acpi_get_numa_info(uint32_t pxm)
 
 	return numa_info;
 }
+#endif
 
 /**
  * amdgpu_acpi_get_node_id - obtain the NUMA node id for corresponding amdgpu