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/rockchip/px30/drivers/pmu/pmu.c b/plat/rockchip/px30/drivers/pmu/pmu.c
index 5f4e64f..8770b2e 100644
--- a/plat/rockchip/px30/drivers/pmu/pmu.c
+++ b/plat/rockchip/px30/drivers/pmu/pmu.c
@@ -45,7 +45,7 @@
 
 static uint32_t cores_pd_cfg_info[PLATFORM_CORE_COUNT]
 #if USE_COHERENT_MEM
-__attribute__ ((section("tzfw_coherent_mem")))
+__attribute__ ((section(".tzfw_coherent_mem")))
 #endif
 ;
 
@@ -101,7 +101,7 @@
 
 static struct px30_sleep_ddr_data ddr_data
 #if USE_COHERENT_MEM
-__attribute__ ((section("tzfw_coherent_mem")))
+__attribute__ ((section(".tzfw_coherent_mem")))
 #endif
 ;