hwrng: optee-rng: use tee_shm_alloc_kernel_buf()

Uses the new simplified tee_shm_alloc_kernel_buf() function instead of
the old deprecated tee_shm_alloc() function which required specific
TEE_SHM-flags.
Reviewed-by: NSumit Garg <sumit.garg@linaro.org>
Signed-off-by: NJens Wiklander <jens.wiklander@linaro.org>

drivers/char/hw_random/optee-rng.c

@@ -145,10 +145,10 @@ static int optee_rng_init(struct hwrng *rng)
 	struct optee_rng_private *pvt_data = to_optee_rng_private(rng);
 	struct tee_shm *entropy_shm_pool = NULL;
 
-	entropy_shm_pool = tee_shm_alloc(pvt_data->ctx, MAX_ENTROPY_REQ_SZ,
-					 TEE_SHM_MAPPED | TEE_SHM_DMA_BUF);
+	entropy_shm_pool = tee_shm_alloc_kernel_buf(pvt_data->ctx,
+						    MAX_ENTROPY_REQ_SZ);
 	if (IS_ERR(entropy_shm_pool)) {
-		dev_err(pvt_data->dev, "tee_shm_alloc failed\n");
+		dev_err(pvt_data->dev, "tee_shm_alloc_kernel_buf failed\n");
 		return PTR_ERR(entropy_shm_pool);
 	}