dt-bindings: use isil prefix for Intersil in vendor-prefixes.txt
This patch fixes DT vendor-prefixes.txt documentation to reference
isil (NASDAQ symbol and the most used prefix inside the kernel) for
Intersil.
It reverts 7c75c1d5e72b ("dt-bindings: Document deprecated device
vendor name to fix related warning").
Signed-off-by: Arnaud Ebalard <arno@natisbad.org>
Signed-off-by: Rob Herring <robh@kernel.org>
Arnaud Ebalard