soc: qcom: dcc: update xpu probe logic to fix failure

TZ image which has registered SCM_SVC_DISABLE_XPU sevice maybe used by
none-dcc-xpu device. Update the xpu check logic to fix the probe
failure issue.

Change-Id: Id2b38d93e7c12648292546592144eda1e82d76be
Signed-off-by: Xiaogang Cui <xiaogang@codeaurora.org>