Linux: fix bug with iomem plugin due to absolute address misuse

[eve-mem]

Hello 🚀

This PR fixes a bug spotted by @4n6-fl and reported via slack.

Essentially an absolute address is used to create an object, but the absolute flag is not set. This means when there is shifting the address will be wrong and cause the problems.

I didn't spot that when testing the plugin when it was first made, sorry...!

Pre patch it isn't possible to run the iomem plugin on this sample:

$ python vol.py -f v6.1.15.dmp linux.iomem
Volatility 3 Framework 2.5.2
Progress:  100.00               Stacking attempts finished
Name    Start   End
WARNING  volatility3.plugins.linux.iomem: Unable to follow pointer to name for resource object at 0xffff89841080, replaced with UnreadableValue


Volatility was unable to read a requested page:
Page error 0xffff90e41080 in layer layer_name (Page Fault at entry 0x0 in table page table)

        * Memory smear during acquisition (try re-acquiring if possible)
        * An intentionally invalid page lookup (operating system protection)
        * A bug in the plugin/volatility3 (re-run with -vvv and file a bug)

No further results will be produced

However with this fix the plugin works as expected:

$ python vol.py -f v6.1.15.dmp linux.iomem
Volatility 3 Framework 2.5.2
Progress:  100.00               Stacking attempts finished
Name    Start   End

PCI mem 0x0     0xffffffffff
* Reserved      0x0     0xfff
* System RAM    0x1000  0x9fbff
* Reserved      0x9fc00 0x9ffff
* PCI Bus 0000:00       0xa0000 0xbffff
* Video ROM     0xc0000 0xc99ff
* Adapter ROM   0xca000 0xcadff
* Adapter ROM   0xcb000 0xcd3ff
* Reserved      0xf0000 0xfffff
** System ROM   0xf0000 0xfffff
* System RAM    0x100000        0xbffd9fff
* Reserved      0xbffda000      0xbfffffff
* PCI Bus 0000:00       0xc0000000      0xfebfffff
** 0000:00:02.0 0xfc000000      0xfcffffff
*** bochs-drm   0xfc000000      0xfcffffff
** PCI Bus 0000:03      0xfd000000      0xfd1fffff
** PCI Bus 0000:02      0xfd200000      0xfd3fffff
** PCI Bus 0000:01      0xfd400000      0xfd5fffff
*** 0000:01:01.0        0xfd400000      0xfd403fff
**** virtio-pci-modern  0xfd400000      0xfd403fff
** 0000:00:03.0 0xfd600000      0xfd603fff
*** virtio-pci-modern   0xfd600000      0xfd603fff
** 0000:00:12.0 0xfd604000      0xfd607fff
*** virtio-pci-modern   0xfd604000      0xfd607fff
** PCI Bus 0000:03      0xfe400000      0xfe5fffff

[ikelos]

Yep, all looks good, thanks for bumping the version number! 5;D