feat(lsinitrd.sh): look for initrd in /usr/lib/modules/

Introduce new path for lsinitrd.sh to look into:

/usr/lib/modules/$kver/initramfs.img

Which is valid on all ostree-based systems, and also other image based
systems with pre-generated initramfs.

Ref: https://issues.redhat.com/browse/RHEL-35890

(cherry picked from commit 7c7cdd9317c21b19a0393f5d28d1acb7ee3ff027 from PR#582)

Resolves: RHEL-35890

lsinitrd.sh

@@ -133,6 +133,8 @@ else
         image="/lib/modules/${KERNEL_VERSION}/initrd"
     elif [[ -f /boot/initramfs-${KERNEL_VERSION}.img ]]; then
         image="/boot/initramfs-${KERNEL_VERSION}.img"
+    elif [[ -f /usr/lib/modules/${KERNEL_VERSION}/initramfs.img ]]; then
+        image="/usr/lib/modules/${KERNEL_VERSION}/initramfs.img"
     elif [[ $MACHINE_ID ]] \
         && mountpoint -q /efi; then
         image="/efi/${MACHINE_ID}/${KERNEL_VERSION}/initrd"