[AMDGPU][MC] Fix for Bug 28167 + LIT tests

Corrected src0 for v_writelane_b32:
- Enabled inline constants and literals for SI/CI (VOP2)
- Enabled inline constants for VI (VOP3)

Reviewers: vpykhtin, arsenm

https://reviews.llvm.org/D31463

llvm-svn: 299555