icnss: Shutdown Adrastea before remapping MSA0

MSA0 is remapped to HLOS during SSR/PDR for ramdump purposes.
Remap this memory region only after Adrastea is being shutdown, otherwise
Adrastea could still try to access this region resulting in SMMU fault.

CRs-Fixed: 1082630
Change-Id: I490b5679de4cb4837f5ed5d4e40d339e12c8ecc9
Signed-off-by: Sameer Thalappil <sameert@codeaurora.org>