Move SIMD code to a separate header

Passed Non-regression STC:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 115328 W: 29903 L: 29777 D: 55648
Ptnml(0-2): 265, 12293, 32444, 12375, 287
https://tests.stockfishchess.org/tests/view/68300e086ec7634154f9b1d1

closes https://github.com/official-stockfish/Stockfish/pull/6086

no functional change

src/nnue/features/half_ka_v2_hm.cpp

@@ -23,7 +23,7 @@
 #include "../../bitboard.h"
 #include "../../position.h"
 #include "../../types.h"
-#include "../nnue_accumulator.h"
+#include "../nnue_common.h"
 
 namespace Stockfish::Eval::NNUE::Features {