[Blackfin] arch: theres no need to declare ram{end,start,base} in the head.S files

theres no need to declare ram{end,start,base} in the head.S files
when declaring them with the other memory related variables in setup.c
is so much simpler/nicer

Signed-off-by: Mike Frysinger <vapier.adi@gmail.com>
Signed-off-by: Bryan Wu <cooloney@kernel.org>

diff --git a/arch/blackfin/kernel/setup.c b/arch/blackfin/kernel/setup.c
index a871d83..3f10aa4 100644
--- a/arch/blackfin/kernel/setup.c
+++ b/arch/blackfin/kernel/setup.c
@@ -35,6 +35,7 @@
 EXPORT_SYMBOL(_bfin_swrst);
 
 unsigned long memory_start, memory_end, physical_mem_end;
+unsigned long _rambase, _ramstart, _ramend;
 unsigned long reserved_mem_dcache_on;
 unsigned long reserved_mem_icache_on;
 EXPORT_SYMBOL(memory_start);