[MIPS] Kconfig: Enable 64BIT_PHYS_ADDR only through select.

The user should not have to have any clue about this setting.

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index 3b404b7..f08c735 100644
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -1427,8 +1427,7 @@
 	default y
 
 config 64BIT_PHYS_ADDR
-	bool "Support for 64-bit physical address space"
-	depends on (CPU_R4X00 || CPU_R5000 || CPU_RM7000 || CPU_RM9000 || CPU_R10000 || CPU_SB1 || CPU_MIPS32 || CPU_MIPS64) && 32BIT
+	bool
 
 config CPU_HAS_LLSC
 	bool