drm/i915: add new "soc" sub-directory and move PCH and DRAM code there

Add a new sub-directory for things that aren't specifically about the
GPU and don't really belong in the i915 driver top level, but also don't
belong under any of the existing sub-directories either.

Name it "soc", and move the PCH and DRAM code there.

Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Cc: Tvrtko Ursulin <tvrtko.ursulin@linux.intel.com>
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Acked-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20221208142347.602726-1-jani.nikula@intel.com

drivers/gpu/drm/i915/Makefile

@@ -48,9 +48,7 @@ i915-y += i915_driver.o \
 	  i915_sysfs.o \
 	  i915_utils.o \
 	  intel_device_info.o \
-	  intel_dram.o \
 	  intel_memory_region.o \
-	  intel_pch.o \
 	  intel_pcode.o \
 	  intel_pm.o \
 	  intel_region_ttm.o \
@@ -62,6 +60,11 @@ i915-y += i915_driver.o \
 	  vlv_sideband.o \
 	  vlv_suspend.o
 
+# core peripheral code
+i915-y += \
+	soc/intel_dram.o \
+	soc/intel_pch.o
+
 # core library code
 i915-y += \
 	i915_memcpy.o \

drivers/gpu/drm/i915/i915_driver.c

@@ -75,6 +75,8 @@
 
 #include "pxp/intel_pxp_pm.h"
 
+#include "soc/intel_dram.h"
+
 #include "i915_file_private.h"
 #include "i915_debugfs.h"
 #include "i915_driver.h"
@@ -93,7 +95,6 @@
 #include "i915_sysfs.h"
 #include "i915_utils.h"
 #include "i915_vgpu.h"
-#include "intel_dram.h"
 #include "intel_gvt.h"
 #include "intel_memory_region.h"
 #include "intel_pci_config.h"

drivers/gpu/drm/i915/i915_drv.h

@@ -49,6 +49,8 @@
 #include "gt/intel_workarounds.h"
 #include "gt/uc/intel_uc.h"
 
+#include "soc/intel_pch.h"
+
 #include "i915_drm_client.h"
 #include "i915_gem.h"
 #include "i915_gpu_error.h"
@@ -58,7 +60,6 @@
 #include "i915_utils.h"
 #include "intel_device_info.h"
 #include "intel_memory_region.h"
-#include "intel_pch.h"
 #include "intel_runtime_pm.h"
 #include "intel_step.h"
 #include "intel_uncore.h"