linker_lists: Rename sections to remove . prefix

Rename the sections used to implement linker lists so they begin with
'__u_boot_list' rather than '.u_boot_list'. The double underscore at the
start is still distinct from the single underscore used by the symbol
names.

Having a '.' in the section names conflicts with clang's ASAN
instrumentation which tries to add redzones between the linker list
elements, causing expected accesses to fail. However, clang doesn't try
to add redzones to user sections, which are names with all alphanumeric
and underscore characters.

Signed-off-by: Andrew Scull <ascull@google.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/arch/mips/config.mk b/arch/mips/config.mk
index faf4129..04f3627 100644
--- a/arch/mips/config.mk
+++ b/arch/mips/config.mk
@@ -65,6 +65,6 @@
 KBUILD_LDFLAGS			+= -G 0 -static -n -nostdlib
 PLATFORM_RELFLAGS		+= -ffunction-sections -fdata-sections
 LDFLAGS_FINAL			+= --gc-sections
-OBJCOPYFLAGS			+= -j .text -j .rodata -j .data -j .u_boot_list
+OBJCOPYFLAGS			+= -j .text -j .rodata -j .data -j __u_boot_list
 
 LDFLAGS_STANDALONE		+= --gc-sections