Revert "spi: microchip-core: switch to use modern name"

This reverts commit b39ec657 which is
commit 8f8bf52e upstream.

It breaks the Android kernel abi and can be brought back in the future
in an abi-safe way if it is really needed.

Bug: 161946584
Change-Id: Id0361c629d7c4941f132ac93f035f05fc5bf5099
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>