platform: msm_shared: Increase the buffer size for new nodes and properties

If there is a longer kernel cmdline and the total size of the data
that needs to be updated exceeds the DTB_PAD_SIZE, the pre-allocated
padding size is not enough and it will get an error when trying to
get node info.

Change-Id: I2349e6657d24e1862a7d99d1982f1a3a390b59af