media: c8sectpfe: Clean up handling of *_buffer_aligned

There are a few cases where code is harder than needed to read.
Improve those by:
- dropping unnecessary castings (see note below)
- use PTR_ALING() to be more explicit on what's going on there
- use proper definitions instead of hard coded values

Note, dropping castings will allow to perform an additional check
that type is not changed from void * to something else, e.g. u64,
which may very well break the bitmap APIs.

Link: https://lore.kernel.org/linux-media/[email protected]
Signed-off-by: Andy Shevchenko <[email protected]>
Reviewed-by: Alain Volmat <[email protected]>
Signed-off-by: Mauro Carvalho Chehab <[email protected]>

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