drm/i915/utils: remove unused KBps/MBps/GBps macros

Remove unused macros. If needed again, such macros belong in
<linux/units.h>.
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Reviewed-by: Matthew Auld <matthew.auld@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220815080907.3229449-1-jani.nikula@intel.com

drivers/gpu/drm/i915/i915_utils.h

@@ -360,10 +360,6 @@ wait_remaining_ms_from_jiffies(unsigned long timestamp_jiffies, int to_wait_ms)
 #define KHz(x) (1000 * (x))
 #define MHz(x) KHz(1000 * (x))
 
-#define KBps(x) (1000 * (x))
-#define MBps(x) KBps(1000 * (x))
-#define GBps(x) ((u64)1000 * MBps((x)))
-
 void add_taint_for_CI(struct drm_i915_private *i915, unsigned int taint);
 static inline void __add_taint_for_CI(unsigned int taint)
 {