Revert "spi: axi-spi-engine: fix version format string"

This reverts commit 5d6e336b which is
commit 0064db9c 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: Icdd3df2a340324be18475d14dfdcef0f4617542d
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>