west.yml: update modules hal stm32 for stm32mp2x

Update west.yml to add the STM32MP2x SoC support in the STM32 HAL.
This depends on the followin Pull Request:
zephyrproject-rtos/hal_stm32#282

Signed-off-by: Youssef Zini <youssef.zini@savoirfairelinux.com>

Author: youssefz24

west.yml

@@ -240,7 +240,7 @@ manifest:
       groups:
         - hal
     - name: hal_stm32
-      revision: 02d82ee3aa0daa29ab6f107f9969508b89bc6bf7
+      revision: pull/282/head
       path: modules/hal/stm32
       groups:
         - hal