[AMDGPU][test]added unique and sort options for update_mc_test_check script

[broxigarchen]

add a unique and a sort option to the update_mc_test_check script.

These mc asm/dasm files are usually large in number of lines, and these lines are mostly similar to each other. These options can be useful when maintainer is merging or resolving conflicts by making the file identifical

Also fixed a small issue in asm/dasm such that the auto generated header line is

1. asm using ";" instead of "//" as comment marker
2. dasm using ";" instead of "#" as comment marker