Don't use MSAA config if can't resolve

Bug: skia:8243
Change-Id: I538e7181ab9922bbabb06e4acde1d560f2502de1
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/220216
Auto-Submit: Jim Van Verth <jvanverth@google.com>
Reviewed-by: Robert Phillips <robertphillips@google.com>
Commit-Queue: Jim Van Verth <jvanverth@google.com>

Author: jvanverth

src/gpu/mtl/GrMtlCaps.mm

@@ -417,17 +417,15 @@
     if (this->isMac()) {
         info->fFlags = ConfigInfo::kAllFlags;
     } else {
-        info->fFlags = ConfigInfo::kTextureable_Flag | ConfigInfo::kRenderable_Flag |
-                       ConfigInfo::kMSAA_Flag;
+        info->fFlags = ConfigInfo::kTextureable_Flag | ConfigInfo::kRenderable_Flag;
     }
 
     // RG_1616 uses RG16Unorm
     info = &fConfigTable[kRG_1616_GrPixelConfig];
     if (this->isMac()) {
         info->fFlags = ConfigInfo::kAllFlags;
     } else {
-        info->fFlags = ConfigInfo::kTextureable_Flag | ConfigInfo::kRenderable_Flag |
-                       ConfigInfo::kMSAA_Flag;
+        info->fFlags = ConfigInfo::kTextureable_Flag | ConfigInfo::kRenderable_Flag;
     }
 }