Replace includes of build.h with version.h

As build.h is an auto-generated file it was necessary to add it as
an explicit prerequisite in the Makefiles. When this was forgotten
abuild would sometimes fail with following error:

   fatal error: build.h: No such file or directory

Fix this error by compiling version.c into all stages.

Change-Id: I342f341077cc7496aed279b00baaa957aa2af0db
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: http://review.coreboot.org/7510
Tested-by: build bot (Jenkins)
Reviewed-by: Edward O'Callaghan <eocallaghan@alterapraxis.com>

src/soc/intel/fsp_baytrail/romstage/Makefile.inc

@@ -22,5 +22,3 @@ romstage-y += romstage.c
 romstage-y += pmc.c
 romstage-y += report_platform.c
 romstage-$(CONFIG_ENABLE_BUILTIN_COM1) += uart.c
-
-$(obj)/soc/intel/fsp_baytrail/romstage/romstage.romstage.o : $(obj)/build.h

src/soc/intel/fsp_baytrail/romstage/romstage.c

@@ -40,7 +40,7 @@
 #include <drivers/intel/fsp/fsp_util.h>
 #include <baytrail/pmc.h>
 #include <baytrail/spi.h>
-#include <build.h>
+#include <version.h>
 #include <pc80/mc146818rtc.h>
 #include <device/pci_def.h>
 #include <console/cbmem_console.h>
@@ -142,11 +142,8 @@ static void baytrail_rtc_init(void)
 
 	if (rtc_failed) {
 		printk(BIOS_DEBUG,
-			"RTC Failure detected.  Resetting Date to %x/%x/%x%x\n",
-			COREBOOT_BUILD_MONTH_BCD,
-			COREBOOT_BUILD_DAY_BCD,
-			0x20,
-			COREBOOT_BUILD_YEAR_BCD);
+			"RTC Failure detected.  Resetting Date to %s\n",
+			coreboot_dmi_date);
 
 		write32(DEFAULT_PBASE + GEN_PMCON1, gen_pmcon1 & ~RPS);
 	}