Revert "spi: introduce new helpers with using modern naming"

This reverts commit 1a8183cc which is
commit b8d3b056 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: I06189e6aba9530c83c5248dbbc4015736bdfd2d5
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>