mbed_error should provide a way to avoid linking to vprintf

[NeilMacMullen]

Mbed 5.9.1

Even with NDEBUG defined, MBED_ERROR defines down to mbed_error which calls print_error_report which in turn uses the vprintf library. This adds between 6 and 7K (under gcc) which is a significant overhead when trying to build a minimal application (e.g. bootloader).

[NeilMacMullen]

Adding @MarceloSalazar for tracking.

[ciarmcom]

ARM Internal Ref: MBOTRIAGE-1026

[SenRamakri]

Fix created - #7404
We don't need to print detailed error report in release builds also avoiding linkage to vprintfs.

[MarceloSalazar]

Confirmed that changes do work now - closing