i2c: eg20t: remove unused function

cppcheck rightfully says:
drivers/i2c/busses/i2c-eg20t.c:266: style: The function 'ktime_lt' is never used

Signed-off-by: Wolfram Sang <wolfram@the-dreams.de>
Cc: Tomoya MORINAGA <tomoya.rohm@gmail.com>
diff --git a/drivers/i2c/busses/i2c-eg20t.c b/drivers/i2c/busses/i2c-eg20t.c
index 93926a7..5441e69 100644
--- a/drivers/i2c/busses/i2c-eg20t.c
+++ b/drivers/i2c/busses/i2c-eg20t.c
@@ -263,11 +263,6 @@
 	init_waitqueue_head(&pch_event);
 }
 
-static inline bool ktime_lt(const ktime_t cmp1, const ktime_t cmp2)
-{
-	return cmp1.tv64 < cmp2.tv64;
-}
-
 /**
  * pch_i2c_wait_for_bus_idle() - check the status of bus.
  * @adap:	Pointer to struct i2c_algo_pch_data.