bfin: move sram_alloc parser to a separate file

* sram_alloc.c: New file.
* Makefile.am (strace_SOURCES): Add it.
* system.c [BFIN]: Move sys_sram_alloc and related code to sram_alloc.c.
diff --git a/Makefile.am b/Makefile.am
index f0e4e13..5abaeea 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -49,6 +49,7 @@
 	signal.c	\
 	sock.c		\
 	socketutils.c	\
+	sram_alloc.c	\
 	statfs.c	\
 	strace.c	\
 	stream.c	\