Merge branch 'bugfix/change_upack(1)_to_pack()' into 'release/v2.x.x'

bugfix(spi): Change upack(1) to pack() to cancel 1-byte alignment

See merge request sdk/ESP8266_RTOS_SDK!454

driver_lib/include/spi_interface.h

@@ -161,7 +161,7 @@ typedef struct
     uint8_t     dataLen;        ///< Data byte length.
 } SpiData;
 
-#pragma upack (1)
+#pragma pack ()
 
 #define SHOWREG() __ShowRegValue(__func__, __LINE__);