[Silicon Labs] Fix regression towards older platforms#1504

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0xc0170 merged 1 commit intoARMmbed:masterfrom

stevew817:feature/fix/serial_NC

Jan 15, 2016

Commits on Jan 15, 2016

Fix regression towards older platforms (did not have RXBLOCK set, resulting in receiving characters even with RX set to NC) by condensing code.
stevew817
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