Renamed cpu/i386/reset.S to resetvec.S

Brings i386 in line with other CPUs with a reset vector and frees up reset.c
for CPU reset functions

Signed-off-by: Graeme Russ <graeme.russ@gmail.com>
diff --git a/cpu/i386/Makefile b/cpu/i386/Makefile
index 50534b6..f20675a 100644
--- a/cpu/i386/Makefile
+++ b/cpu/i386/Makefile
@@ -28,7 +28,7 @@
 
 LIB	= $(obj)lib$(CPU).a
 
-START	= start.o start16.o reset.o
+START	= start.o start16.o resetvec.o
 COBJS	= serial.o interrupts.o cpu.o timer.o sc520.o
 SOBJS	= sc520_asm.o