i2c: hisi: use HZ_PER_KHZ macro in units.h

HZ macros has been centralized in units.h since [1]. Use it to avoid
duplicated definition.

[1] commit e2c77032 ("units: add the HZ macros")
Signed-off-by: Yicong Yang <yangyicong@hisilicon.com>
Signed-off-by: Wolfram Sang <wsa@kernel.org>

drivers/i2c/busses/i2c-hisi.c

@@ -15,6 +15,7 @@
 #include <linux/mod_devicetable.h>
 #include <linux/platform_device.h>
 #include <linux/property.h>
+#include <linux/units.h>
 
 #define HISI_I2C_FRAME_CTRL		0x0000
 #define   HISI_I2C_FRAME_CTRL_SPEED_MODE	GENMASK(1, 0)
@@ -80,8 +81,6 @@
 #define HISI_I2C_TX_F_AE_THRESH		1
 #define HISI_I2C_RX_F_AF_THRESH		60
 
-#define HZ_PER_KHZ	1000
-
 #define NSEC_TO_CYCLES(ns, clk_rate_khz) \
 	DIV_ROUND_UP_ULL((clk_rate_khz) * (ns), NSEC_PER_MSEC)