drm/amdgpu/acpi: make ATPX/ATCS structures global (v2)

They are global ACPI methods, so maybe the structures
global in the driver. This simplified a number of things
in the handling of these methods.

v2: reset the handle if verify interface fails (Lijo)
v3: fix compilation when ACPI is not defined.

Reviewed-by: Lijo Lazar <lijo.lazar@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/amdgpu.h

@@ -268,8 +268,6 @@ struct amdgpu_job;
 struct amdgpu_irq_src;
 struct amdgpu_fpriv;
 struct amdgpu_bo_va_mapping;
-struct amdgpu_atif;
-struct amdgpu_atcs;
 struct kfd_vm_fault_info;
 struct amdgpu_hive_info;
 struct amdgpu_reset_context;
@@ -812,8 +810,6 @@ struct amdgpu_device {
 	struct notifier_block		acpi_nb;
 	struct amdgpu_i2c_chan		*i2c_bus[AMDGPU_MAX_I2C_BUS];
 	struct debugfs_blob_wrapper     debugfs_vbios_blob;
-	struct amdgpu_atif		*atif;
-	struct amdgpu_atcs		*atcs;
 	struct mutex			srbm_mutex;
 	/* GRBM index mutex. Protects concurrent access to GRBM index */
 	struct mutex                    grbm_idx_mutex;
@@ -1348,13 +1344,14 @@ int amdgpu_acpi_pcie_performance_request(struct amdgpu_device *adev,
 						u8 perf_req, bool advertise);
 int amdgpu_acpi_pcie_notify_device_ready(struct amdgpu_device *adev);
 
-void amdgpu_acpi_get_backlight_caps(struct amdgpu_device *adev,
-		struct amdgpu_dm_backlight_caps *caps);
+void amdgpu_acpi_get_backlight_caps(struct amdgpu_dm_backlight_caps *caps);
 bool amdgpu_acpi_is_s0ix_supported(struct amdgpu_device *adev);
+void amdgpu_acpi_detect(void);
 #else
 static inline int amdgpu_acpi_init(struct amdgpu_device *adev) { return 0; }
 static inline void amdgpu_acpi_fini(struct amdgpu_device *adev) { }
 static inline bool amdgpu_acpi_is_s0ix_supported(struct amdgpu_device *adev) { return false; }
+static inline void amdgpu_acpi_detect(void) { }
 #endif
 
 int amdgpu_cs_find_mapping(struct amdgpu_cs_parser *parser,