[IE][CMAKE] Fix build issues with custom configuration (#2851)

* FASTER build enabled
* MYRIAD plugin disabled

inference-engine/src/low_precision_transformations/CMakeLists.txt

@@ -23,7 +23,6 @@ add_library(${TARGET_NAME} SHARED
 
 ie_faster_build(${TARGET_NAME}
     UNITY
-    PCH PRIVATE "src/precomp.hpp"
 )
 
 target_compile_definitions(${TARGET_NAME} PRIVATE inference_engine_transformations_EXPORTS)

inference-engine/src/vpu/common/include/vpu/utils/small_vector.hpp

@@ -305,7 +305,7 @@ public:
     const_reverse_iterator crend() const noexcept { return _base.crend(); }
 
     bool empty() const noexcept { return _base.empty(); }
-#if ENABLE_MYRIAD
+#ifdef ENABLE_MYRIAD
     int size() const noexcept { return static_cast<int>(_base.size()); }
 #else
     size_t size() const noexcept { return _base.size(); }