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/nvidia/tegra/platform.mk b/plat/nvidia/tegra/platform.mk
index 6ed1cdf..2365564 100644
--- a/plat/nvidia/tegra/platform.mk
+++ b/plat/nvidia/tegra/platform.mk
@@ -90,8 +90,8 @@
 # o resolve undefined symbols to el3_panic
 # o include only required sections
 TF_LDFLAGS	+= --diag_suppress=L6314,L6332 --no_scanlib --callgraph
-TF_LDFLAGS	+= --keep="*(__pubsub*)" --keep="*(rt_svc_descs*)" --keep="*(*cpu_ops)"
+TF_LDFLAGS	+= --keep="*(.__pubsub*)" --keep="*(.rt_svc_descs*)" --keep="*(.cpu_ops)"
 ifeq (${ENABLE_PMF},1)
-TF_LDFLAGS	+= --keep="*(*pmf_svc_descs*)"
+TF_LDFLAGS	+= --keep="*(.pmf_svc_descs*)"
 endif
 endif