Add missing license header to udelay.c.
I'm self-ack'ing this, as the origin of the code in udelay.c (and thus
the license and copyright owner) is pretty clear.
The code which is now in udelay.c was split out from flash_rom.c in r1428,
and flash_rom.c, in turn, has been around since the beginning and had a
'Copyright 2000 Silicon Integrated System Corporation' line as well as the
usual GPLv2-or-later license header.
Signed-off-by: Uwe Hermann <email@example.com>
Acked-by: Uwe Hermann <firstname.lastname@example.org>