SDK compile time issue: example: ble_app_hrs_c

[natersoz]

I noticed the following compile time issue in the SDK - both 10 and 11:

The file ./examples/ble_central/ble_app_hrs_c/main.c

needs:

#include "app_uart.h"

For it to compile correctly.

[natersoz]

ARM GCC.

The SDK does in fact compile as delivered. I do have one difference: -DNRF_LOG_USES_RTT instead of -DNRF_LOG_USES_UART

I think that broke it. No source changes.