i2c: mediatek: Fix i2c_spec_values description

The struct i2c_spec_values have it's members documented but is
missing the starting '@', which leads to warings like:

drivers/i2c/busses/i2c-mt65xx.c:267: warning: Function parameter or member 'min_low_ns' not described in 'i2c_spec_values'

We also delete min_high_ns member as it is not used in the code.
Signed-off-by: Matthias Brugger <mbrugger@suse.com>
Reviewed-by: Qii Wang <qii.wang@mediatek.com>
Signed-off-by: Wolfram Sang <wsa@kernel.org>

drivers/i2c/busses/i2c-mt65xx.c

@@ -253,14 +253,13 @@ struct mtk_i2c {
 
 /**
  * struct i2c_spec_values:
- * min_low_ns: min LOW period of the SCL clock
- * min_su_sta_ns: min set-up time for a repeated START condition
- * max_hd_dat_ns: max data hold time
- * min_su_dat_ns: min data set-up time
+ * @min_low_ns: min LOW period of the SCL clock
+ * @min_su_sta_ns: min set-up time for a repeated START condition
+ * @max_hd_dat_ns: max data hold time
+ * @min_su_dat_ns: min data set-up time
  */
 struct i2c_spec_values {
 	unsigned int min_low_ns;
-	unsigned int min_high_ns;
 	unsigned int min_su_sta_ns;
 	unsigned int max_hd_dat_ns;
 	unsigned int min_su_dat_ns;