Added HAL docs, improved HAL init&locking (#218)

TactilityHeadless/Private/Tactility/hal/spi/SpiInit.h

@@ -0,0 +1,17 @@
+#pragma once
+
+#include "Tactility/hal/spi/Spi.h"
+
+#include <vector>
+#include <memory>
+
+namespace tt::hal::spi {
+
+/**
+ * Called by main HAL init to ready the internal state of the SPI HAL.
+ * @param[in] configurations HAL configuration for a board
+ * @return true on success
+ */
+bool init(const std::vector<spi::Configuration>& configurations);
+
+}