added I2C control function (Original program cannot handle I2C constructor)

Dependencies:   TextLCD X_NUCLEO_53L0A1

Fork of HelloWorld_53L0A1 by ST

Revision:
12:e9dedf2d2560
Parent:
11:15185024bf74
--- a/X_NUCLEO_53L0A1.lib	Mon Dec 11 14:45:22 2017 +0000
+++ b/X_NUCLEO_53L0A1.lib	Mon Dec 18 09:56:04 2017 +0000
@@ -1,1 +1,1 @@
-http://os.mbed.com/teams/ST/code/X_NUCLEO_53L0A1/#1727c86ac63b
+http://os.mbed.com/teams/ST/code/X_NUCLEO_53L0A1/#99c367e8a402