aemfvp-a/run-model: Add SATA device parameters to support distro boot

Also, add the following changes to this patch:
1. Add changes for accessing Terminal-0 via Telnet if the Armv-A
   Base AEM FVP is running on non-Xserver support.
2. Add separate scripts for busybox and distro boot support
   on Armv-A Base AEM FVP.

Signed-off-by: Selvarasu Ganesan <Selvarasu.Ganesan@arm.com>
Change-Id: I06a7a31be749f5fe88c9b2c148d1e787ede7b70f