soc: qcom: pil-msa: Disable ahb clock during modem ramdump collection

On targets with the ahb_clk_vote DT flag, the ahb clock needs to be
disabled in the ramdump collection path. Hence, replace the
pil_mss_shutdown call during modem ramdump collection with the
pil_mss_deinit_image which does the cleanup done in pil_mss_shutdown
and additionally also disables the ahb clock.

CRs-Fixed: 739180
Change-Id: I3437ce87558926953da2d8797d8b6cd8f9d52306
Signed-off-by: Pushkar Joshi <pushkarj@codeaurora.org>