generic_board: reduce the redundancy of gd_t struct members

This commit refactors common/board_f.c and common/board_r.c
in order to delete the dest_addr and dest_addr_sp from
gd_t struct.

As mentioned as follows in include/asm-generic/global_data.h,

  /* TODO: is this the same as relocaddr, or something else? */
  unsigned long dest_addr;        /* Post-relocation address of U-Boot */

dest_addr is the same as relocaddr.
Likewise, dest_addr_sp is the same as start_addr_sp.

It seemed dest_addr/dest_addr_sp was used only as a scratch variable
to calculate relocaddr/start_addr_sp, respectively.

With a little refactoring, we can delete dest_addr and dest_addr_sp.

Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com>
Cc: Simon Glass <sjg@chromium.org>
diff --git a/common/board_r.c b/common/board_r.c
index fd1fd31..f5649c9 100644
--- a/common/board_r.c
+++ b/common/board_r.c
@@ -137,7 +137,7 @@
 #ifdef CONFIG_SYS_SYM_OFFSETS
 	monitor_flash_len = _end_ofs;
 #elif !defined(CONFIG_SANDBOX)
-	monitor_flash_len = (ulong)&__init_end - gd->dest_addr;
+	monitor_flash_len = (ulong)&__init_end - gd->relocaddr;
 #endif
 #if defined(CONFIG_MPC85xx) || defined(CONFIG_MPC86xx)
 	/*
@@ -145,7 +145,7 @@
 	 * We need to update it to point to the same CPU entry in RAM.
 	 * TODO: why not just add gd->reloc_ofs?
 	 */
-	gd->arch.cpu += gd->dest_addr - CONFIG_SYS_MONITOR_BASE;
+	gd->arch.cpu += gd->relocaddr - CONFIG_SYS_MONITOR_BASE;
 
 	/*
 	 * If we didn't know the cpu mask & # cores, we can save them of
@@ -161,7 +161,7 @@
 	 * in SRAM mode and initialize that cache from SRAM mode back to being
 	 * a cache in cpu_init_r.
 	 */
-	gd->env_addr += gd->dest_addr - CONFIG_SYS_MONITOR_BASE;
+	gd->env_addr += gd->relocaddr - CONFIG_SYS_MONITOR_BASE;
 #endif
 	return 0;
 }
@@ -178,7 +178,7 @@
 	/*
 	 * Setup trap handlers
 	 */
-	trap_init(gd->dest_addr);
+	trap_init(gd->relocaddr);
 
 	return 0;
 }
@@ -263,7 +263,7 @@
 	ulong malloc_start;
 
 	/* The malloc area is immediately below the monitor copy in DRAM */
-	malloc_start = gd->dest_addr - TOTAL_MALLOC_LEN;
+	malloc_start = gd->relocaddr - TOTAL_MALLOC_LEN;
 	mem_malloc_init((ulong)map_sysmem(malloc_start, TOTAL_MALLOC_LEN),
 			TOTAL_MALLOC_LEN);
 	return 0;
@@ -276,7 +276,7 @@
 
 static int initr_announce(void)
 {
-	debug("Now running in RAM - U-Boot at: %08lx\n", gd->dest_addr);
+	debug("Now running in RAM - U-Boot at: %08lx\n", gd->relocaddr);
 	return 0;
 }