make / cortex m: replace hyphen in module name

When you compile for UDOO, you are greeted by a multitude of this
warnings:
```
<command-line>:0:14: warning: ISO C99 requires whitespace after the macro name [enabled by default]
```

The reason for that is the argument `-DMODULE_CORTEX-M3_COMMON`.

This PR fixes this problem by replacing hyphens with underscores for the
`-D…` argument.
boards: harmonise cc2420 isr

TelosB, wsn430-v14, Z1
Merge pull request #1304 from thomaseichinger/fix_cc2420_rxfifo_of

boards: harmonise cc2420 isr
Merge pull request #1346 from Kijewski/hyphen-in-modulename

make: cortex m3: replace hyphen in module name