perf: Add EXTRA_LDFLAGS for MIPS N32

MIPS N32 requires EXTRA_LDFLAGS to link correctly.

(From OE-Core rev: 5b3cc758ddd8bfe6e52e6287ddf463c080673a7e)

Signed-off-by: Zubair Lutfullah Kakakhel <Zubair.Kakakhel@imgtec.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-kernel/perf/perf.bb

@@ -80,6 +80,7 @@ EXTRA_OEMAKE = '\
     AR="${AR}" \
     LD="${LD}" \
     EXTRA_CFLAGS="-ldw" \
+    EXTRA_LDFLAGS="${PERF_EXTRA_LDFLAGS}" \
     perfexecdir=${libexecdir} \
     NO_GTK2=1 ${TUI_DEFINES} NO_DWARF=1 ${LIBUNWIND_DEFINES} \
     ${SCRIPTING_DEFINES} ${LIBNUMA_DEFINES} \
@@ -98,6 +99,12 @@ EXTRA_OEMAKE += "\
     'infodir=${@os.path.relpath(infodir, prefix)}' \
 "
 
+PERF_EXTRA_LDFLAGS = ""
+
+# MIPS N32
+PERF_EXTRA_LDFLAGS_mipsarchn32eb = "-m elf32btsmipn32"
+PERF_EXTRA_LDFLAGS_mipsarchn32el = "-m elf32ltsmipn32"
+
 do_compile() {
 	# Linux kernel build system is expected to do the right thing
 	unset CFLAGS