microblaze: Make virt_to_pfn() a static inline

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.

Move the function down in the file so __pa() exists in our
scope, and it compiles. This in turn requires moving __pa()
as it depends on __virt_to_phys() that was below. (Lazy macro
evaluation conflicts with strict function ordering.)

Make a symmetric change to pfn_to_virt() so we have type
checking both ways.

Due to this the <asm/page.h> file being included into some
assembly files, some further inclusion guards are needed
to make sure assembly keeps compiling.

Signed-off-by: Linus Walleij <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Michal Simek <[email protected]>

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