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/M5249EVB.h b/include/configs/M5249EVB.h
index 60e5b45..6167ea1 100644
--- a/include/configs/M5249EVB.h
+++ b/include/configs/M5249EVB.h
@@ -91,6 +91,11 @@
 #define CONFIG_SYS_INIT_SP_OFFSET	CONFIG_SYS_GBL_DATA_OFFSET
 
 #define CONFIG_ENV_IS_IN_FLASH	1
+
+#define LDS_BOARD_TEXT \
+        . = DEFINED(env_offset) ? env_offset : .; \
+        common/env_embedded.o (.text);
+
 #define CONFIG_ENV_OFFSET		0x4000	/* Address of Environment Sector*/
 #define CONFIG_ENV_SIZE		0x2000	/* Total Size of Environment Sector	*/
 #define CONFIG_ENV_SECT_SIZE	0x2000 /* see README - env sector total size	*/