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/arch/aarch64/cpu/cpu_helpers.S b/arch/aarch64/cpu/cpu_helpers.S
index 76edaa3..e7fc8f8 100644
--- a/arch/aarch64/cpu/cpu_helpers.S
+++ b/arch/aarch64/cpu/cpu_helpers.S
@@ -33,7 +33,7 @@
 	.weak	cpu_reset_handler
 
 
-	.section	aarch64_code, "ax"; .align 3
+	.section	.text, "ax"; .align 3
 
 cpu_reset_handler:; .type cpu_reset_handler, %function
 	mov	x19, x30 // lr
diff --git a/arch/system/gic/aarch64/gic_v3_sysregs.S b/arch/system/gic/aarch64/gic_v3_sysregs.S
index 3a2fb6e..ecbc1f7 100644
--- a/arch/system/gic/aarch64/gic_v3_sysregs.S
+++ b/arch/system/gic/aarch64/gic_v3_sysregs.S
@@ -48,7 +48,7 @@
 #define ICC_CTLR_EL3    S3_6_C12_C12_4
 #define ICC_PMR_EL1     S3_0_C4_C6_0
 
-	.section	platform_code, "ax"; .align 3
+	.section	.text, "ax"; .align 3
 
 read_icc_sre_el1:; .type read_icc_sre_el1, %function
 	mrs	x0, ICC_SRE_EL1