soc: qcom: pil: Correct memory-region of_node reference counting

of_parse_phandle() is used to deduce if a memory region is
associated with a particular device. The call to of_parse_phandle()
internally increments the reference count to the memory region's
of_node, and thus, the caller should reverse that action by
decrementing it via a call to of_node_put().

Change-Id: I390b48bef9295258ae950738c0dde99d4604e263
Signed-off-by: Isaac J. Manjarres <isaacm@codeaurora.org>