Remove vestiges of 32 float texture format support

Change-Id: I186b2ea83a0c41f0ff1ecfe4163704c71ed121fb
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/244881
Commit-Queue: Greg Daniel <egdaniel@google.com>
Auto-Submit: Brian Salomon <bsalomon@google.com>
Reviewed-by: Greg Daniel <egdaniel@google.com>
diff --git a/src/gpu/mtl/GrMtlCaps.h b/src/gpu/mtl/GrMtlCaps.h
index d56f3a2..b42a513 100644
--- a/src/gpu/mtl/GrMtlCaps.h
+++ b/src/gpu/mtl/GrMtlCaps.h
@@ -145,9 +145,9 @@
         int fColorTypeInfoCount = 0;
     };
 #ifdef SK_BUILD_FOR_IOS
-    static constexpr size_t kNumMtlFormats = 18;
+    static constexpr size_t kNumMtlFormats = 17;
 #else
-    static constexpr size_t kNumMtlFormats = 15;
+    static constexpr size_t kNumMtlFormats = 14;
 #endif
     static size_t GetFormatIndex(MTLPixelFormat);
     FormatInfo fFormatTable[kNumMtlFormats];