console: Revise serial console configuration names.

The console drivers (especially serial drivers) in Kconfig were named in
different styles. This change will rename configuration names to a better naming
style.

 - EARLY_CONSOLE:
        Enable output in pre-ram stage. (Renamed from EARLY_SERIAL_CONSOLE
        because it also supports non-serial)

 - CONSOLE_SERIAL:
        Enable serial output console, from one of the serial drivers. (Renamed
        from SERIAL_CONSOLE because other non-serial drivers are named as
        CONSOLE_XXX like CONSOLE_CBMEM)

 - CONSOLE_SERIAL_UART:
	Device-specific UART driver. (Renamed from
	CONSOLE_SERIAL_NONSTANDARD_MEM because it may be not memory-mapped)

 - HAVE_UART_SPECIAL:
        A dependency for CONSOLE_SERIAL_UART.

Verified to boot on x86/qemu and armv7/snow, and still seeing console
messages in romstage for both platforms.

Change-Id: I4bea3c8fea05bbb7d78df6bc22f82414ac66f973
Signed-off-by: Hung-Te Lin <hungte@chromium.org>
Reviewed-on: http://review.coreboot.org/2299
Tested-by: build bot (Jenkins)
Reviewed-by: David Hendricks <dhendrix@chromium.org>

src/console/Makefile.inc

@@ -10,13 +10,13 @@ smm-y += vtxprintf.c
 smm-$(CONFIG_SMM_TSEG) += die.c
 
 romstage-y += vtxprintf.c
-romstage-$(CONFIG_EARLY_SERIAL_CONSOLE) += console.c
+romstage-$(CONFIG_EARLY_CONSOLE) += console.c
 romstage-y += post.c
 romstage-y += die.c
 
 # TODO Add vtxprintf.c only when early console is required.
 bootblock-y += vtxprintf.c
-bootblock-$(CONFIG_EARLY_SERIAL_CONSOLE) += console.c
+bootblock-$(CONFIG_EARLY_CONSOLE) += console.c
 bootblock-y += die.c
 
 ramstage-$(CONFIG_CONSOLE_SERIAL8250) += uart8250_console.c