ARM: dts: mdm9630: add support to skip power collapse

Adds the flag qcom,no-power-collapse, which indicates
to the driver that it should not perform core power
collpase as part of the suspend/disconnect flows.

Change-Id: Idd43e2b35d159833f35f3e958670b2265503e9c3
Signed-off-by: Dov Levenglick <dovl@codeaurora.org>