Support Nuvoton's M480 target#446

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ccli8 wants to merge 3 commits intoARMmbed:masterfrom

Commits on Jul 6, 2017

Support Nuvoton's M480 target
ccli8
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Commits on Jul 13, 2017

[M480] Fix SRAM_LENGTH_MIN to 96KiB
ccli8
committed

Commits on Jul 21, 2017

[M480] Remove overriding default_putc
ccli8
committed