Squashed commit of the following:
Author: Gregory Nutt <gnutt@nuttx.org>
Completes review of configs/gapuino.
arch/risc-v/include/gap8/chip.h: Replace the moved chip.h header file with a dummy chip.h header file just to keep the system happy.
Move include/gap8/chip.h to src/gap8/chip.h. Internal details should not be exposed outside of arch/ and configs/. Review all headers files in src/gap8
Review of arch/risc-v/include.
Author: hhuysqt <hyq9606@126.com>
corrected author and email
Add app initialization, add signal support, cleanup irq context and configs
fix some warnings
gapuino initial port
GAP8 initial port
