pthread/Kconfig: add an option to support both unsafe and robust mutex
pthread/Kconfig: add an option to support both unsafe and robust mutex

This patch adds Kconfig menu for UNSAFE and ROBUST MUTEX. All credits
should go to Gregory Nutt who wrote the original commit.

Change-Id: I3d705cfb26d90eebadec2b3963f7828feba902ee
Signed-off-by: Gregory Nutt <604b2037cf31b35be214b8287fbe64214319f37d@nuttx.org>
[Song: backported 666208cf from NuttX]
Signed-off-by: EunBong Song <1a7e7e98e070490e67aa35ab67fbf9fdda8f48ac@samsung.com>

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