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/mediatek/common/mtk_smc_handlers.c b/plat/mediatek/common/mtk_smc_handlers.c
index 92b3873..a8a5a48 100644
--- a/plat/mediatek/common/mtk_smc_handlers.c
+++ b/plat/mediatek/common/mtk_smc_handlers.c
@@ -72,7 +72,7 @@
 	}
 
 #define SMC_ID_EXPAND_AS_DESCRIPTOR_INDEX(_smc_id, _smc_num) \
-	short _smc_id##_descriptor_index __section("mtk_plat_ro") = -1;
+	short _smc_id##_descriptor_index __section(".mtk_plat_ro") = -1;
 
 MTK_SIP_SMC_FROM_BL33_TABLE(SMC_ID_EXPAND_AS_DESCRIPTOR_INDEX);
 MTK_SIP_SMC_FROM_NS_EL1_TABLE(SMC_ID_EXPAND_AS_DESCRIPTOR_INDEX);