Older pSeries systems with serial ports dont get any console output after
recent changes.  CONFIG_ISA does not make sense for CONFIG_PPC_PSERIES
because it enables lots of old drivers.  Instead, remove the dependency on
CONFIG_ISA from the serial port discovery code.
Signed-off-by: Olaf Hering <olh@suse.de>
Cc: Russell King <rmk@arm.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>