tracing: Replace MAX_PARAM_PREFIX_LEN with MODULE_NAME_LEN

Use the MODULE_NAME_LEN definition in module_exists() to obtain the maximum
size of a module name, instead of using MAX_PARAM_PREFIX_LEN. The values
are the same but MODULE_NAME_LEN is more appropriate in this context.
MAX_PARAM_PREFIX_LEN was added in commit 730b69d22525 ("module: check
kernel param length at compile time, not runtime") only to break a circular
dependency between module.h and moduleparam.h, and should mostly be limited
to use in moduleparam.h.

Signed-off-by: Petr Pavlu <[email protected]>
Cc: Steven Rostedt <[email protected]>
Cc: Masami Hiramatsu <[email protected]>
Reviewed-by: Daniel Gomez <[email protected]>
Acked-by: Steven Rostedt (Google) <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Daniel Gomez <[email protected]>

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