csky: Make pfn accessors static inlines

Making virt_to_pfn() a static inline taking a strongly typed
(const void *) makes the contract of a passing a pointer of that
type to the function explicit and exposes any misuse of the
macro virt_to_pfn() acting polymorphic and accepting many types
such as (void *), (unitptr_t) or (unsigned long) as arguments
without warnings.

For symmetry to the same thing with pfn_to_virt().

In order to do this we move the virt_to_phys() and
phys_to_virt() below the definitions of the __pa()
and __va() macros so it compiles. The macro version was also
able to do recursive symbol resolution.

Signed-off-by: Linus Walleij <[email protected]>
Signed-off-by: Guo Ren <[email protected]>
Signed-off-by: Guo Ren <[email protected]>

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