params: clean up module-param macros

Clean up the module-param macros by adding some indentation and using
the __aligned() macro to improve readability.

Link: https://lore.kernel.org/lkml/20201103175711.10731-1-johan@kernel.org


Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Jessica Yu <jeyu@kernel.org>