mm/memremap: Pass down MEMREMAP_* flags to arch_memremap_wb()

x86 version of arch_memremap_wb() needs the flags to decide if the mapping
has to be encrypted or decrypted.

Pass down the flag to arch_memremap_wb(). All current implementations
ignore the argument.

Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: linux-mm@kvack.org
Link: https://lore.kernel.org/r/20250217163822.343400-2-kirill.shutemov@linux.intel.com