drm/i915/gem: Typecheck page lookups

We need to check that we avoid integer overflows when looking up a page,
and so fix all the instances where we have mistakenly used a plain
integer instead of a more suitable long. Be pedantic and add integer
typechecking to the lookup so that we can be sure that we are safe.
And it also uses pgoff_t as our page lookups must remain compatible with
the page cache, pgoff_t is currently exactly unsigned long.

v2: Move added i915_utils's macro into drm_util header (Jani N)
v3: Make not use the same macro name on a function. (Mauro)
    For kernel-doc, macros and functions are handled in the same namespace,
    the same macro name on a function prevents ever adding documentation
    for it.
v4: Add kernel-doc markups to the kAPI functions and macros (Mauoro)
v5: Fix an alignment to match open parenthesis
v6: Rebase
v10: Use assert_typable instead of exactly_pgoff_t() macro. (Kees)
v11: Change the use of assert_typable to assert_same_typable (G.G)
v12: Change to use static_assert(__castable_to_type(n ,T)) style since
     the assert_same_typable() macro has been dropped. (G.G)
v13: Change the use of __castable_to_type() to castable_to_type()
     Remove an unnecessary header include line. (G.G)
v16: Fix "ERROR:SPACING" Checkpatch report (G.G)

Cc: Tvrtko Ursulin <[email protected]>
Cc: Matthew Auld <[email protected]>
Cc: Thomas Hellström <[email protected]>
Cc: Kees Cook <[email protected]>
Signed-off-by: Chris Wilson <[email protected]>
Co-developed-by: Gwan-gyeong Mun <[email protected]>
Signed-off-by: Gwan-gyeong Mun <[email protected]>
Reviewed-by: Nirmoy Das <[email protected]> (v2)
Reviewed-by: Mauro Carvalho Chehab <[email protected]> (v3)
Reviewed-by: Andrzej Hajda <[email protected]> (v5)
Signed-off-by: Rodrigo Vivi <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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