tidy up submodules

Author: cirosantilli

.gitmodules

@@ -2,19 +2,19 @@
 	path = submodules/buildroot
 	url = https://github.com/cirosantilli/buildroot
 	ignore = dirty
-[submodule "submodules/qemu"]
-	path = submodules/qemu
-	url = https://github.com/cirosantilli/qemu
+[submodule "submodules/gem5"]
+	path = submodules/gem5
+	url = https://gem5.googlesource.com/public/gem5
 # The true upstream does not accept git submodule update --init --depth 1
 # git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git
 # But git clone --branch --depth 1 worked weirdly:
 # https://unix.stackexchange.com/questions/338578/linux-kernel-source-code-size-difference
 [submodule "submodules/linux"]
 	path = submodules/linux
 	url = https://github.com/cirosantilli/linux
-[submodule "submodules/gem5"]
-	path = submodules/gem5
-	url = https://gem5.googlesource.com/public/gem5
 [submodule "submodules/parsec-benchmark"]
 	path = submodules/parsec-benchmark
 	url = https://github.com/cirosantilli/parsec-benchmark
+[submodule "submodules/qemu"]
+	path = submodules/qemu
+	url = https://github.com/cirosantilli/qemu