add EXYNOS{4,5} to platform_name tables on arm
add EXYNOS{4,5} to platform_name tables on arm

BUG=chrome-os-partner:10872
TEST=run crossystem on snow, check output

Change-Id: I413cbd86833fc8abff9afbf12a85abe53b586af4
Reviewed-on: https://gerrit.chromium.org/gerrit/26090
Reviewed-by: Bernie Thompson <88a16a105b67ec86732da208bff06a7d4d211801@chromium.org>
Reviewed-by: Bill Richardson <129945214b1d548d8e49b6c29c43094f8c78057f@chromium.org>
Commit-Ready: Olof Johansson <13dc431ca3b0f062f888def8f8ec4662ec608f7d@chromium.org>
Tested-by: Olof Johansson <13dc431ca3b0f062f888def8f8ec4662ec608f7d@chromium.org>

ionave/seismograph,acorn-marvell/vboot_reference,acorn-marvell/vboot_reference,geekboxzone/mmallow_external_vboot_reference,marineam/seismograph,acorn-marvell/vboot_reference,ionave/seismograph,geekboxzone/mmallow_external_vboot_reference,ccaapton/vboot_reference,coreboot/vboot,ccaapton/vboot_reference,marineam/seismograph,ionave/seismograph,acorn-marvell/vboot_reference,coreboot/vboot,ccaapton/vboot_reference,coreboot/vboot,marineam/seismograph,geekboxzone/mmallow_external_vboot_reference,coreboot/vboot,marineam/seismograph,geekboxzone/mmallow_external_vboot_reference,ccaapton/vboot_reference,coreboot/vboot,geekboxzone/mmallow_external_vboot_reference