nasm: update 2.15.05 -> 2.16.01

adjust 0002-Add-debug-prefix-map-option.patch to account for
https://github.com/netwide-assembler/nasm/commit/f2a6eb4aaca361c1ebe374bf07765790eecf8869


and add a chunk to it that guarantees source paths not leaking into debug sections
that list source filenames.

Signed-off-by: Alexander Kanavin <alex@linutronix.de>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>