m68k: Implement ndelay() based on the existing udelay() logic
Add a ndelay macro modeled after the Coldfire udelay(). The ISP1160 driver needs a 150ns delay, so we need to have ndelay(). Signed-off-by: Michael Schmitz <schmitz@debian.org> Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
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