Maintainers.txt: fix incorrect line ending

Commit 005ab4a1
("Maintainers.txt: Update reviewers for IntelSiliconPkg")
introduced incorrect line ending on the added line. Tidy this up.

Signed-off-by: Leif Lindholm <quic_llindhol@quicinc.com>
Cc: Ray Ni <ray.ni@intel.com>
Cc: Michael D Kinney <michael.d.kinney@intel.com>
Reviewed-by: Michael D Kinney <michael.d.kinney@intel.com>