Replace hint_common_parent_position() by backwards accumulator updates

Only calls to `evaluate()` now trigger NNUE accumulator updates. To make
sure that we are likely to find parent positions from which to update
the accumulators we perform a backwards NNUE update whenever we compute
the accumulator from scratch for some position.

passed STC
LLR: 2.93 (-2.94,2.94) <0.00,2.00>
Total: 39680 W: 10474 L: 10164 D: 19042
Ptnml(0-2): 171, 4068, 11042, 4398, 161
https://tests.stockfishchess.org/tests/view/67a27f26eb183d11c65945be

passed LTC
LLR: 2.94 (-2.94,2.94) <0.50,2.50>
Total: 337308 W: 86408 L: 85550 D: 165350
Ptnml(0-2): 276, 30551, 106126, 31441, 260
https://tests.stockfishchess.org/tests/view/67a287efeb183d11c65945ee

then simplified:
STC
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 28608 W: 7641 L: 7413 D: 13554
Ptnml(0-2): 132, 3036, 7744, 3256, 136
https://tests.stockfishchess.org/tests/view/67a4703719f522d3866d3345

LTC
LLR: 2.96 (-2.94,2.94) <-1.75,0.25>
Total: 200226 W: 51026 L: 50990 D: 98210
Ptnml(0-2): 170, 18468, 62799, 18508, 168
https://tests.stockfishchess.org/tests/view/67a4f255229c1a170cc08964

The version in this PR is a bit different from the simplified version,
but it's compile-time changes only.

closes https://github.com/official-stockfish/Stockfish/pull/5870

No functional change

src/nnue/nnue_misc.cpp

@@ -30,7 +30,6 @@
 #include <string_view>
 #include <tuple>
 
-#include "../evaluate.h"
 #include "../position.h"
 #include "../types.h"
 #include "../uci.h"
@@ -43,15 +42,6 @@ namespace Stockfish::Eval::NNUE {
 constexpr std::string_view PieceToChar(" PNBRQK  pnbrqk");
 
 
-void hint_common_parent_position(const Position&    pos,
-                                 const Networks&    networks,
-                                 AccumulatorCaches& caches) {
-    if (Eval::use_smallnet(pos))
-        networks.small.hint_common_access(pos, &caches.small);
-    else
-        networks.big.hint_common_access(pos, &caches.big);
-}
-
 namespace {
 // Converts a Value into (centi)pawns and writes it in a buffer.
 // The buffer must have capacity for at least 5 chars.