ARM: mvebu: Change vendor prefix for Intersil Corporation to isil

Currently there is a wild mixture of isl, isil, and intersil
compatibles in the kernel. At this point, changing the vendor
symbol to the most often used variant, which is equal to the
NASDAQ symbol, isil, should not hurt.

Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
Link: https://lkml.kernel.org/r/1410167960-554-4-git-send-email-p.zabel@pengutronix.de
Signed-off-by: Jason Cooper <jason@lakedaemon.net>