ARC: Remove unused DECLARE_GLOBAL_DATA_PTR from init_helpers.c

"Global data" structure "gd" is not used in init_helpers.c
thus DECLARE_GLOBAL_DATA_PTR might be safely removed.
Signed-off-by: NEugeniy Paltsev <Eugeniy.Paltsev@synopsys.com>
Signed-off-by: NAlexey Brodkin <abrodkin@synopsys.com>

arch/arc/lib/init_helpers.c

@@ -7,8 +7,6 @@
 #include <asm/cache.h>
 #include <common.h>
 
-DECLARE_GLOBAL_DATA_PTR;
-
 int init_cache_f_r(void)
 {
 	sync_n_cleanup_cache_all();