Staging: easycap: Make easycap_debug non-static

The parameter easycap_debug appears in macros JOT and JOM and therefore
needs to be visible from all source files.  The easycap_ prefix should
be sufficient to avoid namespace clashes outside the module.

Signed-off-by: Mike Thomas <rmthomas@sciolus.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>