Revert "spi: zynqmp-gqspi: Convert to platform remove callback returning void"

This reverts commit e514f897 which is
commit 3ffefa1d upstream.

It breaks the build due to the 'remove_new' callback not being present.
Revert it in order to fix the build in the android13-5.15 tree.

Change-Id: I22d25ef61b65ccf0f14a71f4e2a76c3f78486286
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>