Drop an unused and empty "config" entry for PPC_86xx.
It has no keyword entries under it and the following line's
"menuconfig" for the same Kconfig symbol is what kconfig uses.

Fixes: d8267c1a3686 ("powerpc: Add 82xx/83xx/86xx to 6xx Multiplatform")
Signed-off-by: Randy Dunlap <redacted>
Cc: Kumar Gala <redacted>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: linuxppc-dev@lists.ozlabs.org
---
 arch/powerpc/platforms/86xx/Kconfig |    1 -
 1 file changed, 1 deletion(-)

diff -- a/arch/powerpc/platforms/86xx/Kconfig b/arch/powerpc/platforms/86xx/Kconfig

--- a/arch/powerpc/platforms/86xx/Kconfig
+++ b/arch/powerpc/platforms/86xx/Kconfig

@@ -1,5 +1,4 @@
 # SPDX-License-Identifier: GPL-2.0
-config PPC_86xx
 menuconfig PPC_86xx
 	bool "86xx-based boards"
 	depends on PPC_BOOK3S_32