[ARM] pxa/corgi: remove now unused corgi_ssp.c and corgi_lcd.c

Now poodle/corgi/spitz have been been converted to use SPI-based
drivers, remove the now unused corgi_ssp.c and corgi_lcd.c. And
as well as the unused reference of {corgi,spitz}ssp_device.

Signed-off-by: Eric Miao <eric.miao@marvell.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>