Pranav-Madhu authored Feb 19, 2021 and Thomas Abraham committed Feb 22, 2021

Update the ACS documentation with steps to do the test in manual mode
as kernel panic is observed with ACS 3.0 disk image. Also add steps to
skip the PCI excerciser tests from UEFI SBSA test.

Change-Id: I4220fb235d8b0d8f60d7ded513083324f09a6e39
Signed-off-by: Pranav Madhu <pranav.madhu@arm.com>