QcomModulePkg: Correct the destination string length

While concatenating the user provided command line with display string
read from UEFI, there was an issue where the destination string length passed
to function was incorrect. The change is to correctly pass the string length.

Change-Id: I644793dbf55424de607a7fb9db055df998faad05
Signed-off-by: Rahul Sharma <rahsha@codeaurora.org>
1 file changed