sh: Fix incorrect linking with new binutils

Since binutils 2.30 , the resulting U-Boot binary was incorrectly linked
against address 0 instead of text base, fix it.

Signed-off-by: Marek Vasut <marek.vasut+renesas@gmail.com>
Cc: Nobuhiro Iwamatsu <iwamatsu@nigauri.org>

arch/sh/cpu/u-boot.lds

@@ -25,6 +25,7 @@ ENTRY(_start)
 
 SECTIONS
 {
+	. = CONFIG_SYS_TEXT_BASE;
 	reloc_dst = .;
 
 	PROVIDE (_ftext = .);