arm64: flush: include linux/libnvdimm.h

The two cache management functions are declared in libnvdimm.h
but provided by architecture specific code. Without including
the header, this causes a W=1 warning:

arch/arm64/mm/flush.c:96:6: error: no previous prototype for 'arch_wb_cache_pmem' [-Werror=missing-prototypes]
arch/arm64/mm/flush.c:104:6: error: no previous prototype for 'arch_invalidate_pmem' [-Werror=missing-prototypes]

Signed-off-by: Arnd Bergmann <[email protected]>
Reviewed-by: Kees Cook <[email protected]>
Acked-by: Ard Biesheuvel <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Catalin Marinas <[email protected]>

Author: arndb

arch/arm64/mm/flush.c

@@ -8,6 +8,7 @@
 
 #include <linux/export.h>
 #include <linux/mm.h>
+#include <linux/libnvdimm.h>
 #include <linux/pagemap.h>
 
 #include <asm/cacheflush.h>