sparc: Fix the generic IO helpers

This enables the Sparc to use <asm-generic/io.h> to fill in the
missing (undefined) [read|write]sq I/O accessor functions.

This is needed if Sparc[64] ever wants to uses CONFIG_REGMAP_MMIO
which has been patches to use accelerated _noinc accessors
such as readsq/writesq that Sparc64, while being a 64bit platform,
as of now not yet provide.

This comes with the requirement that everything the architecture
already provides needs to be defined, rather than just being,
say, static inline functions.

Bite the bullet and just provide the definitions and make it work.
Compile-tested on sparc32 and sparc64.

Reported-by: kernel test robot <[email protected]>
Signed-off-by: Linus Walleij <[email protected]>
Cc: David S. Miller <[email protected]>
Cc: [email protected]
Cc: [email protected]
Cc: Mark Brown <[email protected]>
Cc: Arnd Bergmann <[email protected]>
Link: https://lore.kernel.org/linux-arm-kernel/[email protected]/
Signed-off-by: Arnd Bergmann <[email protected]>

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