soc/intel/quark: Disable FSP serial output

Disable FSP output when CONFIG_DEFAULT_CONSOLE_LOGLEVEL is not set to 8
(BIOS_SPEW).  Use the console log level to choose between the serial
port address and NULL and pass it to FSP for the serial port address.

TEST=Build and run on Galileo Gen2.

Change-Id: I5498aad218524c211082d85d0ae9aacaf08a80f6
Signed-off-by: Lee Leahy <leroy.p.leahy@intel.com>
Reviewed-on: https://review.coreboot.org/16005
Tested-by: build bot (Jenkins)
Reviewed-by: Patrick Georgi <pgeorgi@google.com>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
2 files changed