mhi: core: add support for arm 32-bit compilation

Add support for arm 32-bit compilation for time synchronization
feature.

CRs-Fixed: 2478833
Change-Id: I3831959c565a625371316261dbe94682ba362e1f
Acked-by: Bhaumik Vasav Bhatt <bbhatt@qti.qualcomm.com>
Signed-off-by: Sujeev Dias <sdias@codeaurora.org>