msm: pil: Migrate to pil_do_ramdump() and do_elf_ramdump() APIs

Use the pil_do_ramdump() and do_elf_ramdump() functions to
simplify the PIL ramdumping code. This saves lines of code and
makes ramdumps work for relocatable images in addition to
removing many hard-coded constants and TODOs in the PIL drivers.

Change-Id: I0d22787b035d28fcf7fbaffa9c157a973c375211
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>