fix: only mark non-rotational HDDs as SSD

[dudyas6]

Problem
Starting with RHCOS 4.19 (possibly other newer kernels), optical drives and some loop devices report rotational=0, causing them to be misclassified as SSD.
RHCOS 4.19+:

lsblk -d -o name,rota
NAME  ROTA
loop0    0
loop1    0  
sda      1
sr0      0  ← CD-ROM incorrectly becomes SSD

RHCOS <= 4.18:

lsblk -d -o name,rota
NAME  ROTA
loop0    0
loop1    1
sda      1
sr0      1  ← CD-ROM correctly stays ODD

The fix
Only promote devices to SSD when they're actually HDD type devices

This is likely a general kernel behavior change, not RHCOS only, so the fix benefits all Linux distributions.

Possible impact
sr0 stays ODD (fixes the core issue)
loop stays Virtual
Non-rotational sd*/vd*/hd*/xvd* still can be promoted to SSD
nvme*/mmc* unchanged

[jaypipes]

Thanks mate! :)