Add flash_procedure for meru

Summary:
As title, oobgrader is failing with:
```
2023-12-04 07:48:34.696630 - Running flash procedure step: /run/flashy/flash_procedure/flash_meru --imagepath /run/upgrade/image --device mtd:flash0
2023-12-04 07:48:36.017120 - flash_procedure exited with non-zero exit code {rs.exit_status}. Run command result: {rs}
2023-12-04 07:48:36.017241 - Command '/run/flashy/flash_procedure/flash_meru --imagepath /run/upgrade/image --device mtd:flash0' exited with non-zero exit code: CommandResult(exit_status=127, stderr='bash: line 1: /run/flashy/flash_procedure/flash_meru: No such file or directoryn', stdout='', exit_signal=None)
```

Test Plan: test_placeholder

Reviewed By: doranand

Differential Revision: D51812322

fbshipit-source-id: cdb249c721aed89206956b3d7d0e0e007d72998b

tools/flashy/flash_procedure/flash_meru.go

@@ -0,0 +1,30 @@
+
+/**
+ * Copyright 2020-present Facebook. All Rights Reserved.
+ *
+ * This program file is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program in a file named COPYING; if not, write to the
+ * Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor,
+ * Boston, MA 02110-1301 USA
+ */
+
+package flash_procedure
+
+import (
+	"github.com/facebook/openbmc/tools/flashy/lib/flash"
+	"github.com/facebook/openbmc/tools/flashy/lib/step"
+)
+
+func init() {
+	step.RegisterStep(flash.FlashCp)
+}