updating submodule heads to point to my own fork

All the bits specific submodules have been forked and this commit updates the
top level bits repo to refer to these forks.

Signed-off-by: Ani Sinha <[email protected]>

Author: ani-sinha

.gitmodules

@@ -1,20 +1,20 @@
 [submodule "deps/acpica"]
 	path = deps/acpica
-	url = ../acpica
+	url = ../bits-acpica
 	fetchRecurseSubmodules = true
 [submodule "deps/fdlibm"]
 	path = deps/fdlibm
-	url = ../fdlibm
+	url = ../bits-fdlibm
 	fetchRecurseSubmodules = true
 [submodule "deps/grub"]
 	path = deps/grub
-	url = ../grub
+	url = ../bits-grub
 	fetchRecurseSubmodules = true
 [submodule "deps/libffi"]
 	path = deps/libffi
-	url = ../libffi
+	url = ../bits-libffi
 	fetchRecurseSubmodules = true
 [submodule "deps/python"]
 	path = deps/python
-	url = ../python
+	url = ../bits-python
 	fetchRecurseSubmodules = true