platforms: remove unnecessary i2c platform abstraction

src/lib/drivers/device/nuttx/I2C.cpp

@@ -182,7 +182,7 @@ I2C::transfer(const uint8_t *send, const unsigned send_len, uint8_t *recv, const
 	do {
 		DEVICE_DEBUG("transfer out %p/%u  in %p/%u", send, send_len, recv, recv_len);
 
-		px4_i2c_msg_t msgv[2] {};
+		i2c_msg_s msgv[2] {};
 		unsigned msgs = 0;
 
 		if (send_len > 0) {

src/lib/drivers/device/nuttx/I2C.hpp

@@ -42,7 +42,7 @@
 
 #include "../CDev.hpp"
 
-#include <px4_platform_common/i2c.h>
+#include <nuttx/i2c/i2c_master.h>
 
 #if !defined(CONFIG_I2C)
 #  error I2C support requires CONFIG_I2C
@@ -113,7 +113,7 @@ protected:
 
 private:
 	uint32_t		_frequency{0};
-	px4_i2c_dev_t		*_dev{nullptr};
+	i2c_master_s		*_dev{nullptr};
 
 };