riscv: remove FIXMAP_PAGE_IO and fall back to its default value

If not defined in the arch, FIXMAP_PAGE_IO defaults to PAGE_KERNEL_IO,
which we defined when adding the svpbmt implementation.

So drop the FIXMAP_PAGE_IO riscv define.

Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Philipp Tomsich <philipp.tomsich@vrull.eu>
Reviewed-by: Guo Ren <guoren@kernel.org>
Link: https://lore.kernel.org/r/20220511192921.2223629-11-heiko@sntech.de
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>

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