arm64: dts: qcom: sc7280: Configure uart7 to support bluetooth on sc7280-idp

Add bluetooth uart pin configuration for sc7280-idp.

Signed-off-by: Rajesh Patil <rajpat@codeaurora.org>
Reviewed-by: Matthias Kaehlcke <mka@chromium.org>
Reviewed-by: Stephen Boyd <swboyd@chromium.org>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Link: https://lore.kernel.org/r/1632399378-12229-7-git-send-email-rajpat@codeaurora.org