m68k: add architecture-specific u-boot.lds

Add architecture-specific u-boot.lds and remove all board-specific
u-boot.lds.

All the .text customization that was board-specific have been
moved inside the related include/configs, inside a
LDS_BOARD_TEXT define.

Signed-off-by: Angelo Dureghello <angelo@sysam.it>
diff --git a/include/configs/M5235EVB.h b/include/configs/M5235EVB.h
index 883347b..4bba815 100644
--- a/include/configs/M5235EVB.h
+++ b/include/configs/M5235EVB.h
@@ -199,6 +199,11 @@
  * Environment is embedded in u-boot in the second sector of the flash
  */
 #define CONFIG_ENV_IS_IN_FLASH	1
+
+#define LDS_BOARD_TEXT \
+	. = DEFINED(env_offset) ? env_offset : .; \
+	common/env_embedded.o (.text);
+
 #ifdef NORFLASH_PS32BIT
 #	define CONFIG_ENV_OFFSET		(0x8000)
 #	define CONFIG_ENV_SIZE		0x4000