lrdp_v2 : Fix for broken clockdump.py

clockdump.py is taking more time because it is going thourgh all
node of of_clk_provider, and some of the node does not have any data
so need to skip those node and continue.
parsing new clk 'spmi_pmic_div_clk_hw_get' added in kernel 4.14

Change-Id: Iaccb93baa566eaaf3031cd7ec2d112f8c867cd38