arc: fix separate compilation of start.o
While testing "arc: make sure _start is in the beginning of .text
section" I haven't done proper clean-up of built binaries and so missed
another tiny bit that lead to the following error:
--->8---
LD u-boot
arc-linux-ld.bfd: cannot find arch/arc/lib/start.o
Makefile:1107: recipe for target 'u-boot' failed
make: *** [u-boot] Error 1
--->8---
Fix is trivial: put "start.o" in "extra-y".
Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com>diff --git a/arch/arc/lib/Makefile b/arch/arc/lib/Makefile
index 459bba9..e592802 100644
--- a/arch/arc/lib/Makefile
+++ b/arch/arc/lib/Makefile
@@ -4,6 +4,7 @@
# SPDX-License-Identifier: GPL-2.0+
#
+extra-y = start.o
head-y := start.o
obj-y += cache.o
obj-y += cpu.o