ARM: dts: msm: Remove existed Bluetooth node for MTP

This dtsi is used for auto, but it includes mtp's dtsi which is
used for mobile.And both dtsi define bt_qca6390 node for QCA6390.
Delete the exist node for MTP in this dtsi to avoid the conflict
in use.

CRs-Fixed: 2550264
Change-Id: Iad719d5b3cb2518788dd7a208981adbe431ceda0
Signed-off-by: Kuichu Ni <kuichun@codeaurora.org>