[llvm-zorg] Flang and MLIR PowerPC buildbot; removed double quoting

Currently the -DLLVM_ENABLE_PROJECTS flag is not being parsed correctly
because of double quoting resulting in '-DLLVM_ENABLE_PROJECTS="mlir"'.
This commit changes zorg to generate -DLLVM_ENABLE_PROJECTS=mlir which
works properly.

Differential Revision: https://reviews.llvm.org/D86219
diff --git a/buildbot/osuosl/master/config/builders.py b/buildbot/osuosl/master/config/builders.py
index 8d6d6c0..150c6f7 100644
--- a/buildbot/osuosl/master/config/builders.py
+++ b/buildbot/osuosl/master/config/builders.py
@@ -1134,7 +1134,7 @@
                             '-DLLVM_TARGETS_TO_BUILD=PowerPC',
                             '-DLLVM_INSTALL_UTILS=ON',
                             '-DCMAKE_CXX_STANDARD=17',
-                            '-DLLVM_ENABLE_PROJECTS="mlir"',
+                            '-DLLVM_ENABLE_PROJECTS=mlir',
                             '-DLLVM_LIT_ARGS="-vj 256"',
                         ],
                         env={
@@ -1615,7 +1615,7 @@
                              '-DLLVM_TARGETS_TO_BUILD=PowerPC',
                              '-DLLVM_INSTALL_UTILS=ON',
                              '-DCMAKE_CXX_STANDARD=17',
-                             '-DLLVM_ENABLE_PROJECTS="flang"',
+                             '-DLLVM_ENABLE_PROJECTS=flang',
                              '-DLLVM_LIT_ARGS="-vj 256"'
                          ],
                          env={