Remove unME11/unME12

The Positive Technologies org is no longer available on GitHub. As these
tools were never directly used, just remove them.

Signed-off-by: Tim Crawford <tcrawford@system76.com>

.gitmodules

@@ -10,14 +10,6 @@
 	path = edk2-platforms
 	url = https://github.com/system76/edk2-platforms.git
 	branch = system76
-[submodule "tools/unME12"]
-	path = tools/unME12
-	url = https://github.com/ptresearch/unME12.git
-	branch = master
-[submodule "tools/unME11"]
-	path = tools/unME11
-	url = https://github.com/ptresearch/unME11.git
-	branch = master
 [submodule "tools/UEFITool"]
 	path = tools/UEFITool
 	url = https://github.com/LongSoft/UEFITool.git