drm/i915/gem: Delete unused code

Unused as of commit 9e0f9464e2 ("drm/i915/gem: Async GPU relocations
only"), but left behind.

>> drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c:933:21: error: unused function 'unmask_page' [-Werror,-Wunused-function]
static inline void *unmask_page(unsigned long p)
^
>> drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c:938:28: error: unused function 'unmask_flags' [-Werror,-Wunused-function]
static inline unsigned int unmask_flags(unsigned long p)
^
>> drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c:945:33: error: unused function 'cache_to_ggtt' [-Werror,-Wunused-function]
static inline struct i915_ggtt *cache_to_ggtt(struct reloc_cache *cache)

Reported-by: kernel test robot <lkp@intel.com>
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/20200605200357.13069-1-chris@chris-wilson.co.uk

drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c

@@ -930,25 +930,6 @@ static void reloc_cache_init(struct reloc_cache *cache,
 	cache->target = NULL;
 }
 
-static inline void *unmask_page(unsigned long p)
-{
-	return (void *)(uintptr_t)(p & PAGE_MASK);
-}
-
-static inline unsigned int unmask_flags(unsigned long p)
-{
-	return p & ~PAGE_MASK;
-}
-
-#define KMAP 0x4 /* after CLFLUSH_FLAGS */
-
-static inline struct i915_ggtt *cache_to_ggtt(struct reloc_cache *cache)
-{
-	struct drm_i915_private *i915 =
-		container_of(cache, struct i915_execbuffer, reloc_cache)->i915;
-	return &i915->ggtt;
-}
-
 #define RELOC_TAIL 4
 
 static int reloc_gpu_chain(struct reloc_cache *cache)