Move ARCH_* from board/Kconfig to cpu or soc Kconfig.

CONFIG_ARCH is a property of the cpu or soc rather than a property of the
board. Hence, move ARCH_* from every single board to respective cpu or soc
Kconfigs. Also update abuild to ignore ARCH_ from mainboards.

Change-Id: I6ec1206de5a20601c32d001a384a47f46e6ce479
Signed-off-by: Furquan Shaikh <furquan@google.com>
Reviewed-on: http://review.coreboot.org/5570
Tested-by: build bot (Jenkins)
Reviewed-by: Kyösti Mälkki <kyosti.malkki@gmail.com>

src/cpu/amd/agesa/Kconfig

@@ -26,6 +26,7 @@ config CPU_AMD_AGESA
 	default y if CPU_AMD_AGESA_FAMILY15_TN
 	default y if CPU_AMD_AGESA_FAMILY16_KB
 	default n
+	select ARCH_X86
 	select TSC_SYNC_LFENCE
 	select UDELAY_LAPIC
 	select LAPIC_MONOTONIC_TIMER

src/cpu/amd/geode_gx1/Kconfig

@@ -19,6 +19,7 @@
 
 config CPU_AMD_GEODE_GX1
 	bool
+	select ARCH_X86
 
 if CPU_AMD_GEODE_GX1
 

src/cpu/amd/geode_gx2/Kconfig

@@ -19,6 +19,7 @@
 
 config CPU_AMD_GEODE_GX2
 	bool
+	select ARCH_X86
 
 if CPU_AMD_GEODE_GX2
 

src/cpu/amd/geode_lx/Kconfig

@@ -1,5 +1,6 @@
 config CPU_AMD_GEODE_LX
 	bool
+	select ARCH_X86
 
 if CPU_AMD_GEODE_LX
 

src/cpu/amd/model_10xxx/Kconfig

@@ -1,5 +1,6 @@
 config CPU_AMD_MODEL_10XXX
 	bool
+	select ARCH_X86
 	select SSE
 	select SSE2
 	select MMCONF_SUPPORT_DEFAULT

src/cpu/amd/model_fxx/Kconfig

@@ -1,5 +1,6 @@
 config CPU_AMD_MODEL_FXX
 	bool
+	select ARCH_X86
 	select MMX
 	select SSE
 	select SSE2

src/cpu/amd/sc520/Kconfig

@@ -1,2 +1,3 @@
 config CPU_AMD_SC520
 	bool
+	select ARCH_X86