ARM: pxa/tosa-bt: add MODULE_LICENSE tag

Without this tag, we get a build warning:

WARNING: modpost: missing MODULE_LICENSE() in arch/arm/mach-pxa/tosa-bt.o

For completeness, I'm also adding author and description fields.

Acked-by: Robert Jarzmik <robert.jarzmik@free.fr>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>