Various improvements/cleanups on the linker scripts

  - Check at link-time that bootloader images will fit in memory
    at run time and that they won't overlap each other.
  - Remove text and rodata orphan sections.
  - Define new linker symbols to remove the need for platform setup
    code to know the order of sections.
  - Reduce the size of the raw binary images by cutting some sections
    out of the disk image and allocating them at load time, whenever
    possible.
  - Rework alignment constraints on sections.
  - Remove unused linker symbols.
  - Homogenize linker symbols names across all BLs.
  - Add some comments in the linker scripts.

Change-Id: I47a328af0ccc7c8ab47fcc0dc6e7dd26160610b9
diff --git a/include/aarch64/arch.h b/include/aarch64/arch.h
index 3a23e4f..055a745 100644
--- a/include/aarch64/arch.h
+++ b/include/aarch64/arch.h
@@ -248,6 +248,8 @@
 #define OSH			(0x2 << 6)
 #define ISH			(0x3 << 6)
 
+#define IS_PAGE_ALIGNED(addr)	(((addr) & 0xFFF) == 0)
+
 /*
  * AP[1] bit is ignored by hardware and is
  * treated as if it is One in EL2/EL3