msm: npu: Add NPU (Neural Processing Unit) driver

Add NPU (neural processing unit) driver framework.
Create a device node as msm_npu. Parse register,
interrupt, clock configuration from device tree.

CRs-Fixed: 2132681
Change-Id: I673fd3f26c084650cac60c5c1e58399a9d35188a
Signed-off-by: Ken Zhang <kenz@codeaurora.org>