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/cpu/Kconfig

@@ -16,7 +16,7 @@ source src/cpu/x86/Kconfig
 
 config CACHE_AS_RAM
 	bool
-	select EARLY_SERIAL_CONSOLE
+	select EARLY_CONSOLE
 	default !ROMCC
 
 config DCACHE_RAM_BASE

src/cpu/samsung/Kconfig

@@ -5,7 +5,10 @@ config CPU_SAMSUNG_EXYNOS
 config CPU_SAMSUNG_EXYNOS5
 	depends on ARCH_ARMV7
 	select CPU_SAMSUNG_EXYNOS
-	select EARLY_SERIAL_CONSOLE
+	select HAVE_UART_SPECIAL
+	# TODO remove EARLY_CONSOLE when we can run ramstage without early UART
+	# init.
+	select EARLY_CONSOLE
 	bool
 	default n