uart: Redefine Kconfig options

Option DRIVERS_UART builds with support for UART hardware.
Option CONSOLE_SERIAL enables the console output for UART.

Those x86 boards that do not have serial port on SuperIO should select
NO_UART_ON_SUPERIO to disable 8250 UART for the default configuration.

Removes:
  CONSOLE_SERIAL_UART
  HAVE_UART_IO_MAPPED
  HAVE_UART_MEMORY_MAPPED

Renames:
  CONSOLE_SERIAL8250     ->  DRIVERS_UART_8250IO
  CONSOLE_SERIAL8250MEM  ->  DRIVERS_UART_8250MEM

Change-Id: Id3afa05f85c0d6849746886db8b6c2ed6c846b61
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: http://review.coreboot.org/5311
Tested-by: build bot (Jenkins)
Reviewed-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>
diff --git a/src/drivers/Makefile.inc b/src/drivers/Makefile.inc
index 197a900..148e257 100644
--- a/src/drivers/Makefile.inc
+++ b/src/drivers/Makefile.inc
@@ -30,7 +30,7 @@
 subdirs-y += realtek
 subdirs-y += sil
 subdirs-y += trident
-subdirs-y += uart
+subdirs-$(CONFIG_DRIVERS_UART) += uart
 subdirs-y += usb
 subdirs-y += ics
 subdirs-y += spi