scripts: checkpatch: Allow quicinc.com identity

Since @quicinc.com identity is now allowed, remove the check
for it from author and Signed-off-by fields.

Change-Id: I83dfae8511f11fcc849db98c42b998ba3c5c0345
Signed-off-by: Vijayanand Jitta <vjitta@codeaurora.org>
Signed-off-by: Komal Bajaj <kbajaj@codeaurora.org>