firmware: qcom_scm: Clear download bit during reboot

During normal restart of a system download bit should
be cleared irrespective of whether download mode is
set or not.

Fixes: 8c1b7dc9 ("firmware: qcom: scm: Expose download-mode control")
Signed-off-by: Mukesh Ojha <quic_mojha@quicinc.com>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/1678979666-551-1-git-send-email-quic_mojha@quicinc.com