[EFM32] Add IAR support for remaining Silicon Labs targets#2707

Merged

sg- merged 3 commits intoARMmbed:masterfrom stevew817:feature/IAR_GiantGecko

Sep 24, 2016

+1,827-8

Commits on Sep 14, 2016

[EFM32] Add IAR support for remaining Silicon Labs targets
stevew817
committed

Commits on Sep 15, 2016

[EFM32] Add all platforms (except Zero) to mbed 5 build
stevew817
committed

Commits on Sep 16, 2016

[EFM32] Remove HG from mbed 5
stevew817
committed