rename 'bpfloader' directory to just 'loader'

//system/bpf/bpfloader/BpfLoader.cpp is just pointlessly wordy.

Test: TreeHugger
Signed-off-by: Maciej Żenczykowski <maze@google.com>
Change-Id: I52a9dd11d2cc844a385e7971e38c7188118aaed0
diff --git a/bpfloader/Android.bp b/loader/Android.bp
similarity index 100%
rename from bpfloader/Android.bp
rename to loader/Android.bp
diff --git a/bpfloader/BpfLoader.cpp b/loader/BpfLoader.cpp
similarity index 100%
rename from bpfloader/BpfLoader.cpp
rename to loader/BpfLoader.cpp