soc/intel/broadwell: Flatten northbridge folder structure

Having folders for bootblock and romstage is no longer necessary.

Change-Id: I7d1f4063de6a1a1ff9ee7478e94f889a50102054
Signed-off-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/46795
Reviewed-by: Michael Niewöhner <foss@mniewoehner.de>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/soc/intel/broadwell/Makefile.inc

@@ -1,11 +1,14 @@
 ifeq ($(CONFIG_SOC_INTEL_BROADWELL),y)
 
-subdirs-y += romstage
-
 subdirs-y += cpu
 subdirs-y += pch
 
-bootblock-y += bootblock/systemagent.c
+bootblock-y += bootblock.c
+
+romstage-y += early_init.c
+romstage-y += raminit.c
+romstage-y += report_platform.c
+romstage-y += romstage.c
 
 ramstage-y += acpi.c
 ramstage-y += finalize.c

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

@@ -1,4 +0,0 @@
-romstage-y += raminit.c
-romstage-y += report_platform.c
-romstage-y += romstage.c
-romstage-y += systemagent.c