Allow linear swizzle mode with tiled image requests.

Mesa address lib faults if the only acceptable swizzle modes are
forbidden.  The old address lib simply ignored the forbidden list
in this case.  Mesa addrlib will not select linear unless there
is no other option so allowing linear mode for tiled images will
still use tiled modes when possible.

Change-Id: I1aa44d072db902c968484dbff67b482af03b45d9

runtime/hsa-runtime/image/image_manager_ai.cpp

@@ -516,19 +516,14 @@ uint32_t ImageManagerAi::GetAddrlibSurfaceInfoAi(
   prefSettingsInput.resourceLoction = ADDR_RSRC_LOC_UNDEF;
   prefSettingsInput.resourceType    = in.resourceType;
 
+  // Disallow all swizzles but linear.
   if (tileMode == Image::TileMode::LINEAR) 
   {
-      // this should force linear.
       prefSettingsInput.forbiddenBlock.macroThin4KB = 1;
       prefSettingsInput.forbiddenBlock.macroThick4KB = 1;
       prefSettingsInput.forbiddenBlock.macroThin64KB = 1;
       prefSettingsInput.forbiddenBlock.macroThick64KB = 1;
   }
-  else
-  {
-      // this should not allow linear.
-      prefSettingsInput.forbiddenBlock.linear = 1;
-  }
 
   prefSettingsInput.forbiddenBlock.micro = 1; // but don't ever allow the 256b swizzle modes
   prefSettingsInput.forbiddenBlock.var = 1; // and don't allow variable-size block modes