riscv: include asm/cacheflush.h in asm/hugetlb.h

PG_dcache_clean is used in asm/hugetlb.h but defined in asm/cacheflush.h:
builds rely on an accident of that being included via linux/mempolicy.h,
but better include it directly (like arch/sh/include/asm/hugetlb.h does).

Link: https://lkml.kernel.org/r/84bd3b96-8dbe-51b1-d7d1-6e4f9d8937d8@google.comSigned-off-by: Hugh Dickins <hughd@google.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Mike Kravetz <mike.kravetz@oracle.com>
Cc: Palmer Dabbelt <palmer@dabbelt.com>
Cc: Russell King <linux@armlinux.org.uk>
Cc: Will Deacon <will@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

arch/riscv/include/asm/hugetlb.h

@@ -2,6 +2,7 @@
 #ifndef _ASM_RISCV_HUGETLB_H
 #define _ASM_RISCV_HUGETLB_H
 
+#include <asm/cacheflush.h>
 #include <asm/page.h>
 
 static inline void arch_clear_hugepage_flags(struct page *page)