drm/i915: Don't use BIT() in UAPI section

Lets not introduce BIT() macro requirement for UAPI for now.

Fixes: 3fd3a6ffe2 ("drm/i915: Simplify i915_reg_read_ioctl")
Signed-off-by: Joonas Lahtinen <[email protected]>
Cc: Chris Wilson <[email protected]>
Reviewed-by: Chris Wilson <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

include/uapi/drm/i915_drm.h

@@ -1318,7 +1318,7 @@ struct drm_i915_reg_read {
 	 * be specified
 	 */
 	__u64 offset;
-#define I915_REG_READ_8B_WA BIT(0)
+#define I915_REG_READ_8B_WA (1ul << 0)
 
 	__u64 val; /* Return value */
 };