Revert "spi: Fix deadlock when adding SPI controllers on SPI buses"

This reverts commit c8dce228 which is
commit 6098475d 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: I5a575970ce7e3cae46b9b3d9373777fbcc48061e
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>