bmc: move away from blobs namespace

The blobs namespace is really owned by phosphor-ipmi-blobs.  Move all
phosphor-ipmi-flash objects into ipmi_flash namespace.

Signed-off-by: Patrick Venture <venture@google.com>
Change-Id: I51b721ad4f3cdc4cc43846c942967ed2e5f16589
diff --git a/image_handler.hpp b/image_handler.hpp
index 0be4590..b7d682b 100644
--- a/image_handler.hpp
+++ b/image_handler.hpp
@@ -6,7 +6,7 @@
 #include <string>
 #include <vector>
 
-namespace blobs
+namespace ipmi_flash
 {
 
 /**
@@ -54,4 +54,4 @@
     ImageHandlerInterface* handler;
 };
 
-} // namespace blobs
+} // namespace ipmi_flash