linker_script: move .rela.dyn section to bl_common.ld.h

The .rela.dyn section is the same for BL2-AT-EL3, BL31, TSP.

Move it to the common header file.

I slightly changed the definition so that we can do "RELA_SECTION >RAM".
It still produced equivalent elf images.

Please note I got rid of '.' from the VMA field. Otherwise, if the end
of previous .data section is not 8-byte aligned, it fails to link.

aarch64-linux-gnu-ld.bfd: warning: changing start of section .rela.dyn by 4 bytes
aarch64-linux-gnu-ld.bfd: warning: changing start of section .rela.dyn by 4 bytes
aarch64-linux-gnu-ld.bfd: warning: changing start of section .rela.dyn by 4 bytes
make: *** [Makefile:1071: build/qemu/release/bl31/bl31.elf] Error 1

Change-Id: Iba7422d99c0374d4d9e97e6fd47bae129dba5cc9
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
diff --git a/bl2/bl2_el3.ld.S b/bl2/bl2_el3.ld.S
index 8c45d98..bc1794c 100644
--- a/bl2/bl2_el3.ld.S
+++ b/bl2/bl2_el3.ld.S
@@ -105,17 +105,7 @@
     __DATA_RAM_START__ = __DATA_START__;
     __DATA_RAM_END__ = __DATA_END__;
 
-    /*
-     * .rela.dyn needs to come after .data for the read-elf utility to parse
-     * this section correctly. Ensure 8-byte alignment so that the fields of
-     * RELA data structure are aligned.
-     */
-    . = ALIGN(8);
-    __RELA_START__ = .;
-    .rela.dyn . : {
-    } >RAM
-    __RELA_END__ = .;
-
+    RELA_SECTION >RAM
     STACK_SECTION >RAM
     BSS_SECTION >RAM
     XLAT_TABLE_SECTION >RAM