Fix duplicate I2C_KEYMAP_START define (#11237)

quantum/split_common/transport.c

@@ -55,14 +55,13 @@ typedef struct _I2C_slave_buffer_t {
 
 static I2C_slave_buffer_t *const i2c_buffer = (I2C_slave_buffer_t *)i2c_slave_reg;
 
+#    define I2C_SYNC_TIME_START offsetof(I2C_slave_buffer_t, sync_timer)
 #    define I2C_KEYMAP_START offsetof(I2C_slave_buffer_t, smatrix)
 #    define I2C_REAL_MODS_START offsetof(I2C_slave_buffer_t, real_mods)
 #    define I2C_WEAK_MODS_START offsetof(I2C_slave_buffer_t, weak_mods)
 #    define I2C_ONESHOT_MODS_START offsetof(I2C_slave_buffer_t, oneshot_mods)
 #    define I2C_BACKLIGHT_START offsetof(I2C_slave_buffer_t, backlight_level)
 #    define I2C_RGB_START offsetof(I2C_slave_buffer_t, rgblight_sync)
-#    define I2C_SYNC_TIME_START offsetof(I2C_slave_buffer_t, sync_timer)
-#    define I2C_KEYMAP_START offsetof(I2C_slave_buffer_t, smatrix)
 #    define I2C_ENCODER_START offsetof(I2C_slave_buffer_t, encoder_state)
 #    define I2C_WPM_START offsetof(I2C_slave_buffer_t, current_wpm)