power: reset: qcom-dload-mode: Add dependency of scm in download driver

Add scm driver dependency in download mode driver, This helps to make sure
that download mode driver probe always happen after scm only.

Change-Id: I49a3f1ae3c610903148f97e0ee68ffdee5d87016
Signed-off-by: Gaurav Kohli <gkohli@codeaurora.org>