avr32: fix relocation address calculation

Commit 1865286466a5d0c7f2e3c37632da56556c838e9e (Introduce generic link
section.h symbol files) changed the __bss_end symbol type from char[] to
ulong. This led to wrong relocation parameters which ended up in a not working
u-boot. Unfortunately this is not clear to see cause due to RAM aliasing we
may get a 'half-working' u-boot then.

Fix this by dereferencing the __bss_end symbol where needed.

Signed-off-by: Andreas Bießmann <andreas.devel@googlemail.com>

arch/avr32/lib/board.c

@@ -116,7 +116,7 @@ static int display_banner (void)
 	printf ("\n\n%s\n\n", version_string);
 	printf ("U-Boot code: %08lx -> %08lx  data: %08lx -> %08lx\n",
 		(unsigned long)_text, (unsigned long)_etext,
-		(unsigned long)_data, (unsigned long)__bss_end);
+		(unsigned long)_data, (unsigned long)(&__bss_end));
 	return 0;
 }
 
@@ -183,7 +183,7 @@ void board_init_f(ulong board_type)
 	 *  - stack
 	 */
 	addr = CONFIG_SYS_SDRAM_BASE + sdram_size;
-	monitor_len = (char *)__bss_end - _text;
+	monitor_len = (char *)(&__bss_end) - _text;
 
 	/*
 	 * Reserve memory for u-boot code, data and bss.