TTY: 8250, revert module name change

TTY: 8250, revert module name change

In 3.7 the 8250 module name was changed unintentionally from 8250 to
8250_core by commit 740ee1d137309c239b38e04a739a26055238da2e
(8250_pnp: do pnp probe before legacy probe). We then had to
re-introduce the old module options to ensure the old good
8250.nr_uart & co. still work. This can be done only by a very dirty
hack and we did it in 8d9f7fb0b9c7ef4e2efbcd0cc75894f88ddb8dda
(serial: 8250: Keep 8250.<xxxx> module options functional after driver
rename).

That is so damn ugly so that I decided to revert to the old module
name and deprecate the new 8250_core options present in 3.7 and 3.8
only. The deprecation will happen in the following patch.

Note that this patch changes the hack above to support "8250_core.*",
because we now have "8250.*" natively.

Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Cc: Josh Boyer <jwboyer@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>