fsp_broadwell_de: enable spi console

this enables spi console for wedge100s with broadwell_de. the console
size is 64kb. enabling spi console in `board.fmd` enables code which
calls into `timer_monotonic_get` (from `spi_flash_cmd_poll_bit`) and
`udelay` (from `ich_status_poll`). this patch selects `TSC_CONSTANT_RATE`
in fsp_broadwell_de's Kconfig to satisfy that.

Change-Id: Ib925c5aee88b65c46a81534405c364dd5649f8e8
Signed-off-by: Okash Khawaja <okash.khawaja@gmail.com>
Reviewed-on: https://review.coreboot.org/28528
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Philipp Deppenwiese <zaolin.daisuki@gmail.com>

src/mainboard/ocp/wedge100s/board.fmd

@@ -21,6 +21,7 @@ FLASH@0xff000000 0x1000000 {
 			RO_VPD@0x0 0x1000
 		}
 		RW_MRC_CACHE@0x10000 0x10000
-		COREBOOT(CBFS)@0x20000 0x7e0000
+		CONSOLE@0x20000 0x10000
+		COREBOOT(CBFS)@0x30000 0x7d0000
 	}
 }