This reverts commit b160628e9e.
There is no need any longer to have this sanity check, because the
previous commit ("parisc: Make CONFIG_64BIT available for ARCH=parisc64
only") prevents that CONFIG_64BIT is set if ARCH==parisc.
Signed-off-by: Helge Deller <deller@gmx.de>
b4b18f47f4