libcamera: matrix: Replace SFINAE with static_asserts

SFINAE is difficult to read and not needed in these cases. Replace it
with static_asserts. The idea came from [1] where it is stated:

"The use of enable_if seems misguided to me. SFINAE is useful for the
situation where we consider multiple candidates for something (overloads
or class template specializations) and try to choose the correct one,
without causing compilation to fail."

[1]: https://stackoverflow.com/questions/62109526/c-friend-template-that-use-sfinae

Signed-off-by: Stefan Klug <stefan.klug@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Paul Elder <paul.elder@ideasonboard.com>
Reviewed-by: Barnabás Pőcze <barnabas.pocze@ideasonboard.com>

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