README.hardware for mpc8315erdb incorrectly specified a null modem serial cable

I noticed this while beta testing 1.2. but patch is against master
(latest commit: bcd4d14425cadc5bd6296f59f14733e8c39c49dd).

Instructions specified a null modem.  This isn't the case.  A straight
serial cable is required.  I verified it with my own setup and
Freescale's user manual.

Signed-off-by: Robert Cochran<yocto@mindchasers.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

README.hardware

@@ -241,8 +241,8 @@ Setup instructions
 You will need the following:
 * NFS root setup on your workstation
 * TFTP server installed on your workstation
-* Null modem cable connected from your workstation to the first serial port
-  on the board
+* Straight-thru 9-conductor serial cable (DB9, M/F) connected from your 
+  PC to UART1
 * Ethernet connected to the first ethernet port on the board
 
 --- Preparation ---