powerpc/85xx: fix PHYS_64BIT selection for P1022DS

Remove wrong CONFIG_ prefix in Kconfig file.
Signed-off-by: Anatolij Gustschin <agust@denx.de>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>

arch/powerpc/platforms/85xx/Kconfig

@@ -80,7 +80,7 @@ config P1010_RDB
 config P1022_DS
 	bool "Freescale P1022 DS"
 	select DEFAULT_UIMAGE
-	select CONFIG_PHYS_64BIT	# The DTS has 36-bit addresses
+	select PHYS_64BIT	# The DTS has 36-bit addresses
 	select SWIOTLB
 	help
 	  This option enables support for the Freescale P1022DS reference board.