Revert "drm/panthor: Fix undefined panthor_device_suspend/resume symbol issue"

This reverts commit 674dc7f6.

The commit causes a recursive dependency in kconfig:

drivers/iommu/Kconfig:14:error: recursive dependency detected!
drivers/iommu/Kconfig:14:	symbol IOMMU_SUPPORT is selected by DRM_PANTHOR
drivers/gpu/drm/panthor/Kconfig:3:	symbol DRM_PANTHOR depends on PM
kernel/power/Kconfig:183:	symbol PM is selected by PM_SLEEP
kernel/power/Kconfig:117:	symbol PM_SLEEP depends on HIBERNATE_CALLBACKS
kernel/power/Kconfig:35:	symbol HIBERNATE_CALLBACKS is selected by XEN_SAVE_RESTORE
arch/x86/xen/Kconfig:67:	symbol XEN_SAVE_RESTORE depends on XEN
arch/x86/xen/Kconfig:6:	symbol XEN depends on PARAVIRT
arch/x86/Kconfig:781:	symbol PARAVIRT is selected by HYPERV
drivers/hv/Kconfig:5:	symbol HYPERV depends on X86_LOCAL_APIC
arch/x86/Kconfig:1106:	symbol X86_LOCAL_APIC depends on X86_UP_APIC
arch/x86/Kconfig:1081:	symbol X86_UP_APIC prompt is visible depending on PCI_MSI
drivers/pci/Kconfig:39:	symbol PCI_MSI is selected by AMD_IOMMU
drivers/iommu/amd/Kconfig:3:	symbol AMD_IOMMU depends on IOMMU_SUPPORT
For a resolution refer to Documentation/kbuild/kconfig-language.rst
subsection "Kconfig recursive dependency limitations"

Fixes: 674dc7f6 ("drm/panthor: Fix undefined panthor_device_suspend/resume symbol issue")
Cc: Boris Brezillon <boris.brezillon@collabora.com>
Cc: Liviu Dudau <liviu.dudau@arm.com>
Cc: Steven Price <steven.price@arm.com>
Acked-by: Boris Brezillon <boris.brezillon@collabora.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240311111619.249776-1-jani.nikula@intel.comSigned-off-by: Jani Nikula <jani.nikula@intel.com>

drivers/gpu/drm/panthor/Kconfig

@@ -6,7 +6,6 @@ config DRM_PANTHOR
 	depends on ARM || ARM64 || COMPILE_TEST
 	depends on !GENERIC_ATOMIC64  # for IOMMU_IO_PGTABLE_LPAE
 	depends on MMU
-	depends on PM
 	select DEVFREQ_GOV_SIMPLE_ONDEMAND
 	select DRM_EXEC
 	select DRM_GEM_SHMEM_HELPER

drivers/gpu/drm/panthor/panthor_device.c

@@ -402,6 +402,7 @@ int panthor_device_mmap_io(struct panthor_device *ptdev, struct vm_area_struct *
 	return 0;
 }
 
+#ifdef CONFIG_PM
 int panthor_device_resume(struct device *dev)
 {
 	struct panthor_device *ptdev = dev_get_drvdata(dev);
@@ -546,3 +547,4 @@ int panthor_device_suspend(struct device *dev)
 	mutex_unlock(&ptdev->pm.mmio_lock);
 	return ret;
 }
+#endif