Merge branch 'driver_merge_tmp/fix_fifo_struct_header' into 'master'

use uint8_t for fifo struct in uart and i2c

use uint8_t for fifo struct in uart and i2c

See merge request !106

components/esp32/include/soc/uart_struct.h

@@ -16,8 +16,8 @@
 typedef volatile struct {
     union {
         struct {
-            uint32_t rw_byte:    8;                 /*This register stores one byte data  read by rx fifo.*/
-            uint32_t reserved8: 24;
+            uint8_t rw_byte;                 /*This register stores one byte data  read by rx fifo.*/
+            uint8_t reserved[3];
         };
         uint32_t val;
     } fifo;