Initial mss_field endian modification

Change-Id: I1e29eafca961b2f762d98bd01fd4716601683174
Original-Change-Id: Ia64288c78b36dc77cd0440a83e859650631e3c06
Reviewed-on: http://rchgit01.rchland.ibm.com/gerrit1/65722
Reviewed-by: Louis Stermole <stermole@us.ibm.com>
Tested-by: Jenkins Server <pfd-jenkins+hostboot@us.ibm.com>
Tested-by: HWSV CI <hwsv-ci+hostboot@us.ibm.com>
Tested-by: Hostboot CI <hostboot-ci+hostboot@us.ibm.com>
Reviewed-by: STEPHEN GLANCY <sglancy@us.ibm.com>
Reviewed-by: Jennifer A. Stofer <stofer@us.ibm.com>
Reviewed-on: http://rchgit01.rchland.ibm.com/gerrit1/68127
Tested-by: Jenkins OP Build CI <op-jenkins+hostboot@us.ibm.com>
Tested-by: Jenkins OP HW <op-hw-jenkins+hostboot@us.ibm.com>
Tested-by: FSP CI Jenkins <fsp-CI-jenkins+hostboot@us.ibm.com>
Reviewed-by: Christian R. Geddes <crgeddes@us.ibm.com>

src/import/chips/ocmb/explorer/procedures/hwp/memory/lib/i2c/exp_i2c.H

@@ -127,12 +127,12 @@ inline void boot_config_setup(std::vector<uint8_t>& io_data)
 
 {
     // Need data length as well - boot config can only ever be written
-    io_data.insert(io_data.begin(), FW_BOOT_CONFIG_BYTE_LEN);
+    io_data.push_back(FW_BOOT_CONFIG_BYTE_LEN);
 
     // Then add the command
-    io_data.insert(io_data.begin(), FW_BOOT_CONFIG);
+    io_data.push_back(FW_BOOT_CONFIG);
 
-    // Written commands need to be in the form of
+    // Written commands need to be in the form of (MSB first)
     // CMD
     // DATA LEN
     // DATA