arm64: vdso32: Add DWARF_DEBUG

When building the 32-bit vDSO with LLVM 15 and CONFIG_DEBUG_INFO, there
are the following orphan section warnings:

  ld.lld: warning: arch/arm64/kernel/vdso32/note.o:(.debug_abbrev) is being placed in '.debug_abbrev'
  ld.lld: warning: arch/arm64/kernel/vdso32/note.o:(.debug_info) is being placed in '.debug_info'
  ld.lld: warning: arch/arm64/kernel/vdso32/note.o:(.debug_str_offsets) is being placed in '.debug_str_offsets'
  ld.lld: warning: arch/arm64/kernel/vdso32/note.o:(.debug_str) is being placed in '.debug_str'
  ld.lld: warning: arch/arm64/kernel/vdso32/note.o:(.debug_addr) is being placed in '.debug_addr'
  ld.lld: warning: arch/arm64/kernel/vdso32/note.o:(.debug_line) is being placed in '.debug_line'
  ld.lld: warning: arch/arm64/kernel/vdso32/note.o:(.debug_line_str) is being placed in '.debug_line_str'
  ld.lld: warning: arch/arm64/kernel/vdso32/vgettimeofday.o:(.debug_loclists) is being placed in '.debug_loclists'
  ld.lld: warning: arch/arm64/kernel/vdso32/vgettimeofday.o:(.debug_abbrev) is being placed in '.debug_abbrev'
  ld.lld: warning: arch/arm64/kernel/vdso32/vgettimeofday.o:(.debug_info) is being placed in '.debug_info'
  ld.lld: warning: arch/arm64/kernel/vdso32/vgettimeofday.o:(.debug_rnglists) is being placed in '.debug_rnglists'
  ld.lld: warning: arch/arm64/kernel/vdso32/vgettimeofday.o:(.debug_str_offsets) is being placed in '.debug_str_offsets'
  ld.lld: warning: arch/arm64/kernel/vdso32/vgettimeofday.o:(.debug_str) is being placed in '.debug_str'
  ld.lld: warning: arch/arm64/kernel/vdso32/vgettimeofday.o:(.debug_addr) is being placed in '.debug_addr'
  ld.lld: warning: arch/arm64/kernel/vdso32/vgettimeofday.o:(.debug_frame) is being placed in '.debug_frame'
  ld.lld: warning: arch/arm64/kernel/vdso32/vgettimeofday.o:(.debug_line) is being placed in '.debug_line'
  ld.lld: warning: arch/arm64/kernel/vdso32/vgettimeofday.o:(.debug_line_str) is being placed in '.debug_line_str'

These are DWARF5 sections, as that is the implicit default version for
clang-14 and newer when just '-g' is used. All DWARF sections are
handled by the DWARF_DEBUG macro from include/asm-generic/vmlinux.lds.h
so use that macro here to fix the warnings regardless of DWARF version.

Fixes: 9d4775b3 ("arm64: vdso32: enable orphan handling for VDSO")
Signed-off-by: Nathan Chancellor <nathan@kernel.org>
Reviewed-by: Nick Desaulniers <ndesaulniers@google.com>
Link: https://lore.kernel.org/r/20220630153121.1317045-3-nathan@kernel.orgSigned-off-by: Will Deacon <will@kernel.org>

arch/arm64/kernel/vdso32/vdso.lds.S

@@ -57,6 +57,7 @@ SECTIONS
 	.rel.dyn	: { *(.rel*) }
 
 	.ARM.exidx : { *(.ARM.exidx*) }
+	DWARF_DEBUG
 	ELF_DETAILS
 	.ARM.attributes 0 : { *(.ARM.attributes) }