SAM Watchdog:  Register the watchdog device at the configured device path CONFIG_WATCHDOG_DEVPATH vs. hard-coded /dev/wdt

DO NOT MERGE Until Alan Verifies this -

and will generate a link error if CONFIG_LIBC_LOCALE is not defined
and setlocale is referneced. With CONFIG_LIBC_LOCALE defined
setlocale will act as if MB string is not supported and return
"C" for POSIX. C and ""

add tim8 to stm32f103v pinmap

Remove comments that no longer apply.  clocale should not do anyting if CONFIG_LIBC_LOCALE is not defined.

Upstream kinetis to greg

Add support for the RISC-V architecture and configs/nr5m100-nexys4 board.  I will be making the FPGA code for this available soon (within a week I would say).  The board support on this is pretty thin, but it seems like maybe a good idea to get the base RISC-V stuff in since there are people interested in it.