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/window_hw_interface.hpp b/window_hw_interface.hpp
index 60c600f..0c24dc8 100644
--- a/window_hw_interface.hpp
+++ b/window_hw_interface.hpp
@@ -4,7 +4,7 @@
 #include <utility>
 #include <vector>
 
-namespace blobs
+namespace ipmi_flash
 {
 
 /**
@@ -46,4 +46,4 @@
     virtual std::vector<std::uint8_t> copyFrom(std::uint32_t length) = 0;
 };
 
-} // namespace blobs
+} // namespace ipmi_flash