soc: qcom: smem: Use uint64_t instead of phys_addr_t

Reading max item from wrong offset in smem_targ_info_type
structure due to previous structure member is using compiler
dependent data type.

Use uint64_t data type instead of compiler dependent phys_addr_t.

CRs-Fixed: 2416801
Change-Id: Ibc03eb53ea086ea9ebc0a9a03a5a7591b7bae157
Signed-off-by: Deepak Kumar Singh <deesin@codeaurora.org>