[test] FunctionPointer testcase defined serial baudrate explicitly

[PrzemekWirkus]

Description

In test there is an explicit serial port baudrate specified:

• https://github.com/ARMmbed/core-util/blob/master/test/FunctionPointer/main.cpp#L45, see:

void runTest(void) {
    static Serial pc(USBTX, USBRX);
    pc.baud(115200);

Change required ?

With new configuration merged by Brendan (default baudrate in yotta_config):

• https://github.com/ARMmbed/target-mbed-gcc/pull/20/files (targett.json change)
• https://github.com/ARMmbed/mbed-drivers/pull/128/files (mbed-drivers allign)

  Greentea response

• In Greentea I've implemented yotta_config (for serial port baudrate) response for Brendan's changes: Add yotta config parse greentea#41.
• So this baudrate setting can be removed when we merge Greentea.

[ciarmcom]

ARM Internal Ref: IOTSFW-1377