QcomModulePkg: Append the user display cmdline upon success

Append the user display commandline to original display commandline only
when the read is successful.

Secure devices would get the read failed from devinfo & hence the bootup
fails.

Change-Id: Ifd8920486d8de9463103e82ae711789a2c08103a
Signed-off-by: Rahul Sharma <rahsha@codeaurora.org>
1 file changed