[M] Change in libgfxinit[cros]: gma tgl: Clean up the code for gfx plls

[Dinesh Gehlot (Code Review)]

Attention is currently required from: Angel Pons, Paul Menzel.

Hello Angel Pons,

I'd like you to reexamine a change. Please visit

https://review.coreboot.org/c/libgfxinit/+/82209?usp=email

to look at the new patch set (#7).

Change subject: gma tgl: Clean up the code for gfx plls
......................................................................

gma tgl: Clean up the code for gfx plls

This patch improves code quality through various optimizations, such as
replacing indexed array access with direct value access and simplifying
variable declarations. It also simplifies function rewrites by using
constructs like case-when instead of multiple range mappings or if else
blocks. Additionally, the patch addresses minor typographical errors.
These changes enhance the code's readability and maintainability
without impacting functionality.

Change-Id: Iaeeb8f9272b962342179880bb5b5dd4261211e8e
Signed-off-by: Dinesh Gehlot 
---
M common/tigerlake/hw-gfx-gma-plls-combo_phy.adb
M common/tigerlake/hw-gfx-gma-plls-dkl.adb
M common/tigerlake/hw-gfx-gma-plls.adb
M common/tigerlake/hw-gfx-gma-plls.ads
4 files changed, 44 insertions(+), 68 deletions(-)

git pull ssh://review.coreboot.org:29418/libgfxinit refs/changes/09/82209/7