ext: hal: add stm32mp1 exti ll driver

The stm32mp1 exti ll driver is mandatory for compilation.
add it on top of stm32cubeMP1 version 1.0.0.

Signed-off-by: Arnaud Pouliquen <[email protected]>

Author: arnopo

ext/hal/st/stm32cube/stm32mp1xx/README

@@ -36,4 +36,13 @@ License Link:
 
 Patch List:
 
-    * Initial version
+    * Initial version 1.0.0
+
+    * Add stm32mp1 exti ll driver
+    The stm32mp1 exti ll driver is mandatory for compilation.
+    add it on top of stm32cubeMP1 version 1.0.0.
+    Impacted files:
+      ext/hal/st/stm32cube/stm32mp1xx/README
+      ext/hal/st/stm32cube/stm32mp1xx/drivers/include/stm32mp1xx_ll_exti.h
+      ext/hal/st/stm32cube/stm32mp1xx/drivers/src/stm32mp1xx_ll_exti.c
+    ST Bug tracker ID: None