board: dh_stm32mp1: Remove gpio_hog_probe_all() from board

DM_GPIO_HOG flag has been replaced by GPIO_HOG flag since a while in
commit 49b10cb49262 ("gpio: fixes for gpio-hog support").

And furthermore, gpio_hog_probe_all() is already called in board_r.c.
So gpio_hog_probe() can be removed from stm32mp1.c.

Signed-off-by: Patrice Chotard <patrice.chotard@foss.st.com>
Cc: Marek Vasut <marex@denx.de>
Reviewed-by: Patrick Delaunay <patrick.delaunay@foss.st.com>
diff --git a/board/dhelectronics/dh_stm32mp1/board.c b/board/dhelectronics/dh_stm32mp1/board.c
index 765b54a..957208c 100644
--- a/board/dhelectronics/dh_stm32mp1/board.c
+++ b/board/dhelectronics/dh_stm32mp1/board.c
@@ -590,9 +590,6 @@
 /* board dependent setup after realloc */
 int board_init(void)
 {
-	if (CONFIG_IS_ENABLED(DM_GPIO_HOG))
-		gpio_hog_probe_all();
-
 	board_key_check();
 
 #ifdef CONFIG_DM_REGULATOR