MIPS: Add dependencies for HAVE_ARCH_TRANSPARENT_HUGEPAGE

[Ben Hutchings <ben@decadent.org.uk>]

The MIPS implementation of transparent huge-pages (THP) is 64-bit only,
and of course also requires that the CPU supports huge-pages.

Currently it's entirely possible to enable THP in other configurations,
which then fail to build due to pfn_pmd() not being defined.

Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Cc: David Daney <david.daney@cavium.com>
---
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -19,7 +19,7 @@ config MIPS
        select HAVE_KRETPROBES
        select HAVE_DEBUG_KMEMLEAK
        select ARCH_BINFMT_ELF_RANDOMIZE_PIE
-       select HAVE_ARCH_TRANSPARENT_HUGEPAGE
+       select HAVE_ARCH_TRANSPARENT_HUGEPAGE if CPU_SUPPORTS_HUGEPAGES && 64BIT
        select RTC_LIB if !MACH_LOONGSON
        select GENERIC_ATOMIC64 if !64BIT
        select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE

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