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/bdinfo.c b/arch/xtensa/lib/bdinfo.c
new file mode 100644
index 0000000..4ec8529
--- /dev/null
+++ b/arch/xtensa/lib/bdinfo.c
@@ -0,0 +1,22 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * XTENSA-specific information for the 'bd' command
+ *
+ * (C) Copyright 2003
+ * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
+ */
+
+#include <common.h>
+#include <init.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+int arch_setup_bdinfo(void)
+{
+	struct bd_info *bd = gd->bd;
+
+	bd->bi_memstart = PHYSADDR(CONFIG_SYS_SDRAM_BASE);
+	bd->bi_memsize = CONFIG_SYS_SDRAM_SIZE;
+
+	return 0;
+}