I2C: Fix readReg to ensure it sends I2C STOP after the read

changelog for 626c4e1

Author: gfwilliams

ChangeLog

@@ -21,6 +21,7 @@
             Bluetooth: Increase size of max advertising received (now ~120b on high MTU builds)
             nRF52840: Fix crash if receiving >32b of advertisement data
             Jolt.js: Fix memory leak in Q0/1/2/3.setPower
+            I2C: Fix readReg to ensure it sends I2C STOP after the read
 
      2v27 : nRF5x: Ensure Bluetooth notifications work correctly when two separate connections use the same handle for their characteristics
             nRF5x: Remove handlers from our handlers array when a device is disconnected