avr32: add generic board support

Signed-off-by: Andreas Bießmann <andreas.devel@googlemail.com>
diff --git a/arch/avr32/cpu/u-boot.lds b/arch/avr32/cpu/u-boot.lds
index cb29a22..b0180e3 100644
--- a/arch/avr32/cpu/u-boot.lds
+++ b/arch/avr32/cpu/u-boot.lds
@@ -48,9 +48,11 @@
 	_edata = .;
 
 	.bss (NOLOAD) : {
+		__bss_start = .;
 		*(.bss)
 		*(.bss.*)
 	}
 	. = ALIGN(8);
 	__bss_end = .;
+	__init_end = .;
 }