build: always prefix section names with `.`

Some of our specialized sections are not prefixed with the conventional
period. The compiler uses input section names to derive certain other
section names (e.g. `.rela.text`, `.relacpu_ops`), and these can be
difficult to select in linker scripts when there is a lack of a
delimiter.

This change introduces the period prefix to all specialized section
names.

BREAKING-CHANGE: All input and output linker section names have been
 prefixed with the period character, e.g. `cpu_ops` -> `.cpu_ops`.

Change-Id: I51c13c5266d5975fbd944ef4961328e72f82fc1c
Signed-off-by: Chris Kay <chris.kay@arm.com>
diff --git a/plat/socionext/synquacer/include/plat.ld.S b/plat/socionext/synquacer/include/plat.ld.S
index af7a172..d02afa7 100644
--- a/plat/socionext/synquacer/include/plat.ld.S
+++ b/plat/socionext/synquacer/include/plat.ld.S
@@ -23,8 +23,8 @@
 	 * not support inner shareable WBWA mappings so it is mapped normal
 	 * non-cacheable)
 	 */
-	sp_xlat_table (NOLOAD) : ALIGN(PAGE_SIZE) {
-		*(sp_xlat_table)
+	.sp_xlat_table (NOLOAD) : ALIGN(PAGE_SIZE) {
+		*(.sp_xlat_table)
 	} >SP_DRAM
 }