Blackfin: replace "bfin_reset_or_hang()" with "panic()"

The bfin_reset_or_hang function unnecessarily duplicates the panic()
logic based on CONFIG_PANIC_HANG.

This patch deletes 20 lines of code and just calls panic() instead.
This also makes the following generic-restart conversion patch simpler.

Signed-off-by: Kyle Moffett <Kyle.D.Moffett@boeing.com>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
diff --git a/arch/blackfin/cpu/traps.c b/arch/blackfin/cpu/traps.c
index 09388aa..0cb833a 100644
--- a/arch/blackfin/cpu/traps.c
+++ b/arch/blackfin/cpu/traps.c
@@ -426,5 +426,5 @@
 	unsigned long tflags;
 	trace_buffer_save(tflags);
 	bfin_dump(regs);
-	bfin_reset_or_hang();
+	panic("PANIC: Blackfin internal error");
 }