board_f: Factor out bdinfo bi_mem{start, size} to setup_bdinfo

Move all assignments to gd->bd->bi_mem{start,size} to generic code in
setup_bdinfo.

Xtensa architecture is special in this regard as it defines its own
handling of gd->bd->bi_mem{start,size} fields. In order to avoid defining
a weak SDRAM function, let arch_setup_bdinfo overwrite the generic flags.

For ARC architecture, remove ARCH_EARLY_INIT_R from Kconfig since it is
not needed anymore.

Also, use gd->ram_base to populate bi_memstart to avoid an ifdef.

Signed-off-by: Ovidiu Panait <ovidiu.panait@windriver.com>
Acked-by: Alexey Brodkin <abrokdin@synopsys.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/arch/xtensa/lib/Makefile b/arch/xtensa/lib/Makefile
index c59df7d..ceee59b 100644
--- a/arch/xtensa/lib/Makefile
+++ b/arch/xtensa/lib/Makefile
@@ -5,4 +5,4 @@
 
 obj-$(CONFIG_CMD_BOOTM) += bootm.o
 
-obj-y 	+= cache.o misc.o relocate.o time.o
+obj-y 	+= cache.o misc.o relocate.o time.o bdinfo.o