x86: bootblock: remove linking and program flow from build system

The build system was previously determining the flow
and linking scripts bootblock code by the order of files
added to the bootblock_inc bootblock-y variables.Those
files were then concatenated together and built by a myriad of
make rules.

Now bootblock.S and bootblock.ld is added so that bootblock
can be built and linked using the default build rules.
CHIPSET_BOOTBLOCK_INCLUDE is introduced in order to allow the
chipset code to place include files in the path of the bootblock
program -- a replacement for the chipset_bootblock_inc
make variable.

BUG=chrome-os-partner:44827
BRANCH=None
TEST=Built vortex, rambi, and some asus boards.

Change-Id: Ida4571cbe6eed65e77ade98b8d9ad056353c53f9
Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: http://review.coreboot.org/11495
Tested-by: build bot (Jenkins)
Reviewed-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>
Reviewed-by: Patrick Georgi <pgeorgi@google.com>

src/cpu/dmp/vortex86ex/Kconfig

@@ -77,4 +77,8 @@ config PLL_500_375_33
 
 endchoice
 
+config CHIPSET_BOOTBLOCK_INCLUDE
+	string
+	default "cpu/dmp/vortex86ex/chipset_bootblock.inc"
+
 endif

src/cpu/dmp/vortex86ex/Makefile.inc

@@ -23,8 +23,6 @@ subdirs-y += ../../x86/lapic
 subdirs-y += ../../x86/cache
 subdirs-y += ../../x86/smm
 
-chipset_bootblock_inc += $(src)/cpu/dmp/vortex86ex/biosdata.inc
-chipset_bootblock_inc += $(src)/cpu/dmp/vortex86ex/biosdata_ex.inc
 bootblock-y += biosdata.ld
 bootblock-y += biosdata_ex.ld
 

src/cpu/dmp/vortex86ex/biosdata.inc

@@ -37,7 +37,7 @@
 
 	.section ".dmp_kbd_fw_part1", "a", @progbits
 
-	#include "src/cpu/dmp/vortex86ex/dmp_kbd_fw_part1.inc"
+	#include "dmp_kbd_fw_part1.inc"
 
 .previous
 

src/cpu/dmp/vortex86ex/chipset_bootblock.inc

@@ -0,0 +1,2 @@
+#include "biosdata.inc"
+#include "biosdata_ex.inc"