drm/i915: Move phys objects to its own file

Continuing the decluttering of i915_gem.c, this time the legacy physical
object.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Matthew Auld <matthew.auld@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190528092956.14910-5-chris@chris-wilson.co.uk
diff --git a/drivers/gpu/drm/i915/Makefile b/drivers/gpu/drm/i915/Makefile
index ccf0520..a584fff 100644
--- a/drivers/gpu/drm/i915/Makefile
+++ b/drivers/gpu/drm/i915/Makefile
@@ -88,6 +88,8 @@
 obj-y += gem/
 gem-y += \
 	gem/i915_gem_object.o \
+	gem/i915_gem_pages.o \
+	gem/i915_gem_phys.o \
 	gem/i915_gem_shmem.o
 i915-y += \
 	  $(gem-y) \