openfimg: compiler: Fix typo in translate_trig

Signed-off-by: Tomasz Figa <tomasz.figa@gmail.com>
openfimg: compiler: Fix translation of POW instruction

Signed-off-by: Tomasz Figa <tomasz.figa@gmail.com>
openfimg: compiler: Make LIT more conformant

Seems like _LIT variants of LOG, MUL and EXP instructions behave
quite differently than normal ones, making the results not conform to
glean tests. However when normal variants are used, the results are
visually worse, so as an intermediate solution, LOG_LIT is used to make
the rendering visually correct and let one of glean tests pass, while
still leaving the other one failed...

Signed-off-by: Tomasz Figa <tomasz.figa@gmail.com>