Move function/data sections to common CFLAGS

Instead of adding -ffunction-sections and -fdata-sections to
every architecture, just add it to CFLAGS_common, thus making
sure that new architectures will pick it up automatically.

Change-Id: I38e878851226565b7791d05e222cb4e502e0c8a3
Signed-off-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
Reviewed-on: http://review.coreboot.org/11105
Tested-by: build bot (Jenkins)
Reviewed-by: Patrick Georgi <pgeorgi@google.com>
diff --git a/Makefile.inc b/Makefile.inc
index 6ebf6d4..706ab80 100644
--- a/Makefile.inc
+++ b/Makefile.inc
@@ -270,6 +270,8 @@
 CFLAGS_common += -nostdlib -Wall -Wundef -Wstrict-prototypes -Wmissing-prototypes
 CFLAGS_common += -Wwrite-strings -Wredundant-decls -Wno-trigraphs
 CFLAGS_common += -Wstrict-aliasing -Wshadow
+CFLAGS_common += -fno-common -ffreestanding -fno-builtin -fomit-frame-pointer
+CFLAGS_common += -ffunction-sections -fdata-sections
 
 ifeq ($(CONFIG_COMPILER_GCC),y)
 # cf. commit f69a99db (coreboot: x86: enable gc-sections)
@@ -279,7 +281,6 @@
 ifeq ($(CONFIG_WARNINGS_ARE_ERRORS),y)
 CFLAGS_common += -Werror
 endif
-CFLAGS_common += -fno-common -ffreestanding -fno-builtin -fomit-frame-pointer
 ifneq ($(GDB_DEBUG),)
 CFLAGS_common += -Og
 else