[AMDGPU][CodeGen][True16][Test] add test files for gfx12 vop1 instructions in true16/fake16 format (#106093)

This is a NFC change to add tests for true16/fake16 flow. We need to
have two sets of asm/disasm tests for true16 and fake16 flow and this
patch is adding the missing one. The naming convension is that true16
filename is the default one while the fake16 filename has "fake16"
attached to it.

This patch
1. add true16 and fake16 version for vop1 test files
2. rename a test file to keep a consistant naming pattern

The true16 test file will be updated when more true16 commands are
supported in the up coming patches

Author: broxigarchen