Add type "SD" to allow eStoraged on sd devices

This change will allow eMMC to work with SD devices.

Change-Id: I686ef42d946f4c97f8fc04bf1280277b12f69333
Signed-off-by: John Edward Broadbent <jebr@google.com>
diff --git a/src/util.cpp b/src/util.cpp
index 9952bca..b971646 100644
--- a/src/util.cpp
+++ b/src/util.cpp
@@ -193,7 +193,7 @@
             std::ifstream typeFile(curPath, std::ios_base::in);
             std::string devType;
             typeFile >> devType;
-            if (devType.compare("MMC") == 0)
+            if (devType.compare("MMC") == 0 || devType.compare("SD") == 0)
             {
                 /* Found it. Get the sysfs directory and device file. */
                 std::filesystem::path deviceName(dirEntry.path().filename());