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/renesas/common/aarch64/platform_common.c b/plat/renesas/common/aarch64/platform_common.c
index b0a88cb..17ccb28 100644
--- a/plat/renesas/common/aarch64/platform_common.c
+++ b/plat/renesas/common/aarch64/platform_common.c
@@ -28,7 +28,7 @@
 #endif
 
 const uint8_t version_of_renesas[VERSION_OF_RENESAS_MAXLEN]
-		__attribute__ ((__section__("ro"))) = VERSION_OF_RENESAS;
+		__attribute__ ((__section__(".ro"))) = VERSION_OF_RENESAS;
 
 #define MAP_SHARED_RAM		MAP_REGION_FLAT(RCAR_SHARED_MEM_BASE,	\
 					RCAR_SHARED_MEM_SIZE,		\