Keith Packard a0d3436486 cpu/fe310: Add PICOLIBC support [v3]
Disable the newlib-nano stubs code when picolibc is in use

Signed-off-by: Keith Packard <keithp@keithp.com>

---
v2:
	Squash fixes in
v3:
	call stdio_init in _PICOLIBC_ mode to initialize uart
v3:
	Remove call to stdio_init from nanostubs_init, always
	call from cpu_init.
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