linking: move romstage and bootblock to use program.ld

Instead of having separate <stage>.ld files in src/lib
one file can be used: program.ld. There's now only one
touch point for stage layout.

BUG=chrome-os-partner:44827
BRANCH=None
TEST=Built a myriad of boards. Analyzed readelf output.

Change-Id: I4c3e3671d696caa2c7601065a85fab803e86f971
Signed-off-by: Aaron Durbin <adubin@chromium.org>
Reviewed-on: http://review.coreboot.org/11509
Tested-by: build bot (Jenkins)
Reviewed-by: Patrick Georgi <pgeorgi@google.com>

src/lib/Makefile.inc

@@ -194,8 +194,8 @@ secmon-y += halt.c
 ifneq ($(CONFIG_ARCH_X86),y)
 # X86 bootblock and romstage use custom ldscripts that are all glued together,
 # so we need to exclude it here or it would pick these up as well
-bootblock-y += bootblock.ld
-romstage-y += romstage.ld
+bootblock-y += program.ld
+romstage-y += program.ld
 endif
 
 ramstage-y += program.ld