tee: sandbox: fix spelling errors

Fix spelling errors in comments.

Reviewed-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Reviewed-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
Signed-off-by: Igor Opaniuk <igor.opaniuk@gmail.com>
diff --git a/drivers/tee/sandbox.c b/drivers/tee/sandbox.c
index 86219a9..ec66401 100644
--- a/drivers/tee/sandbox.c
+++ b/drivers/tee/sandbox.c
@@ -14,7 +14,7 @@
 #include "optee/optee_private.h"
 
 /*
- * The sandbox tee driver tries to emulate a generic Trusted Exectution
+ * The sandbox tee driver tries to emulate a generic Trusted Execution
  * Environment (TEE) with the Trusted Applications (TA) OPTEE_TA_AVB and
  * OPTEE_TA_RPC_TEST available.
  */
@@ -23,7 +23,7 @@
 /**
  * struct ta_entry - TA entries
  * @uuid:		UUID of an emulated TA
- * @open_session	Called when a session is openened to the TA
+ * @open_session	Called when a session is opened to the TA
  * @invoke_func		Called when a function in the TA is to be invoked
  *
  * This struct is used to register TAs in this sandbox emulation of a TEE.
@@ -140,8 +140,8 @@
 			provisioned = true;
 
 		/*
-		 * Either way, we asume both operations succeeded and that
-		 * the communication channel has now been stablished
+		 * Either way, we assume both operations succeeded and that
+		 * the communication channel has now been established
 		 */
 
 		return TEE_SUCCESS;