Add pattern write and verify to erase

The goals are to write a non-compressible and verifiable pattern to the
drive as a means to validate that the drive is working, and ensure all
blocks have been overwritten.

Tested:
$ systemctl stop emmc.service
$ ./eStoraged  -b /dev/mmcblk0&
$busctl call xyz.openbmc_project.eStoraged.mmcblk0 /xyz/openbmc_project/storage/mmcblk0 xyz.openbmc_project.Inventory.Item.Volume Erase s xyz.openbmc_project.Inventory.Item.Volume.EraseMethod.LogicalOverWrite --timeout=1200

$busctl call xyz.openbmc_project.eStoraged.mmcblk0 /xyz/openbmc_project/storage/mmcblk0 xyz.openbmc_project.Inventory.Item.Volume Erase s xyz.openbmc_project.Inventory.Item.Volume.EraseMethod.LogicalVerify --timeout=1200

$echo "jebr" > /dev/mmcblk0

$busctl call xyz.openbmc_project.eStoraged.mmcblk0 /xyz/openbmc_project/storage/mmcblk0 xyz.openbmc_project.Inventory.Item.Volume Erase s xyz.openbmc_project.Inventory.Item.Volume.EraseMethod.LogicalVerify --timeout=1200
Call failed: The operation failed internally.

Change-Id: Ibc1254279b1f46246eb37056ea6e4e1a57159bb9
Signed-off-by: John Edward Broadbent <jebr@google.com>
diff --git a/src/erase/meson.build b/src/erase/meson.build
index 6aaf3a3..7dbd727 100644
--- a/src/erase/meson.build
+++ b/src/erase/meson.build
@@ -1,6 +1,7 @@
 libeStoragedErase_lib = static_library(
   'libeStoragedErase-lib',
   'verifyDriveGeometry.cpp',
+  'pattern.cpp',
   'erase.cpp',
   include_directories : eStoraged_headers,
   implicit_include_directories: false,