[CPU] Fixed BF16 Matmul inference precision (openvinotoolkit#22994)

### Details:
CPU plugin uses EnforceInferencePrecision routine for BF16 precision
mark-up. Its logic assumes only activations precision is changed before
Matmul op, while weights precision keeps w/o any changes. Since
dnnlFCTypeMapping misses BF16 activation, FP32 weights optimized
configuration for bf16, execution always happens in FP32 precision even
user manually set infer_precision=bf16.
This bug is not visible on FP16 IRs (since BF16+FP16 config is present),
so only FP32 IRs affected. SInce `save_model` and ovc apply FP16
compression be default, the issue mostly applicable for pipelines which
use a model directly after `convert_model` call.

src/plugins/intel_cpu/src/nodes/executors/fullyconnected_implementations.cpp

@@ -40,7 +40,7 @@ static const LayoutConfig dnnlFCLayoutConfig{LayoutType::ncsp, LayoutType::ncsp,
 // clang-format off
 static const TypeMapping dnnlFCTypeMapping {
     // {src, wei, bia, dst}                              pt<src, wei, bias, dst>
-    {{_bf16, _bf16, _any, _bf16 | _f32},                 pt(bypass(), bypass(), use<3>(), use<3>())},
+    {{_bf16, _bf16 | _f32, _any, _bf16 | _f32},          pt(bypass(), bypass(), use<3>(), use<3>())},
     {{_f16, _f16, _any, _f16 | _f32},                    pt(bypass(), bypass(), use<3>(), use<3>())},
     // integer precision outputs are not supported for float precision inputs
     {{_f32 | _bf16 | _f16, _any, _any, _i8 | _u8},       pt(bypass(), bypass(), use<0>(), use<0>())},
@@ -63,7 +63,7 @@ static const MappingNotation dnnlConvolutionMappingNotation {
 
 static const TypeMapping dnnlConvolutionTypeMapping {
     // {src, wei, bia, dst}                        pt<src, wei, bias, dst>
-    {{_bf16, _bf16, _any, _bf16 | _f32},           pt(bypass(), bypass(), use<3>(), use<3>())},
+    {{_bf16, _bf16 | _f32, _any, _bf16 | _f32},    pt(bypass(), bypass(), use<3>(), use<3>())},
     {{_f16, _f16, _any, _f16 | _f32},              pt(bypass(), bypass(), use<3>(), use<3>())},
     // integer precision outputs are not supported for float precision inputs
     {{_f32 | _bf16 | _f16, _any, _any, _i8 | _u8}, pt(bypass(), bypass(), use<0>(), use<0>())},