S5L8702: Rename nor-* to norboot-*

Since the SPI NOR flash is only used for the bootloader, rename the files accordingly, This is a preparation for the nandboot driver will be introduced, since S5L8720+ don't have an SPI NOR flash anymore.

This is a part of the large iPod Nano 4G and iPod Touch 2G support patch.

Credit: Cástor Muñoz <cmvidal@gmail.com>
Change-Id: Iea835fd2029470bfe9f813631ad4f3db711facc3

firmware/target/arm/s5l8702/norboot-s5l8702.c

@@ -27,7 +27,7 @@
 #include "s5l87xx.h"
 #include "spi-s5l8702.h"
 #include "crypto-s5l8702.h"
-#include "nor-target.h"
+#include "norboot-target.h"
 
 static void bootflash_ce(int port, bool state)
 {