ARM: dts: msm: Move PDC node for sdm845/sdm670

Move out PDC node from PM nodes to reduce time taken to
find pdc handle. As "of_find_node_by_phandle" function
iterates through root node to find the handle, it takes
longer time for interrupt maps to find pdc node, if pdc node defined
in PM nodes.

Change-Id: I198c710734abf59b691c8c3b6239a44ab378f4c5
Signed-off-by: Raghavendra Kakarla <rkakarla@codeaurora.org>