i2c: introduce chip specific cmd register number

Merges https://github.com/espressif/esp-idf/pull/10811

components/soc/esp32s2/include/soc/Kconfig.soc_caps.in

@@ -367,6 +367,10 @@ config SOC_I2C_FIFO_LEN
     int
     default 32
 
+config SOC_I2C_CMD_REG_NUM
+    int
+    default 16
+
 config SOC_I2C_SUPPORT_SLAVE
     bool
     default y

components/soc/esp32s2/include/soc/soc_caps.h

@@ -174,6 +174,7 @@
 #define SOC_I2C_NUM            (2)
 
 #define SOC_I2C_FIFO_LEN       (32) /*!< I2C hardware FIFO depth */
+#define SOC_I2C_CMD_REG_NUM    (16) /*!< Number of I2C command registers */
 #define SOC_I2C_SUPPORT_SLAVE       (1)
 
 // FSM_RST only resets the FSM, not using it. So SOC_I2C_SUPPORT_HW_FSM_RST not defined.