board: engicam: stm32mp1: convert to livetree

Replace gd->fdt_blob access with fdt_getprop() function to the
function ofnode_get_property() to support a live tree.

Signed-off-by: Patrick Delaunay <patrick.delaunay@foss.st.com>
Reviewed-by: Patrice Chotard <patrice.chotard@foss.st.com>
diff --git a/board/engicam/stm32mp1/stm32mp1.c b/board/engicam/stm32mp1/stm32mp1.c
index 20d8603..0a3e580 100644
--- a/board/engicam/stm32mp1/stm32mp1.c
+++ b/board/engicam/stm32mp1/stm32mp1.c
@@ -14,8 +14,6 @@
 #include <asm/arch/sys_proto.h>
 #include <power/regulator.h>
 
-DECLARE_GLOBAL_DATA_PTR;
-
 int checkboard(void)
 {
 	char *mode;
@@ -28,8 +26,8 @@
 		mode = "basic";
 
 	printf("Board: stm32mp1 in %s mode", mode);
-	fdt_compat = fdt_getprop(gd->fdt_blob, 0, "compatible",
-				 &fdt_compat_len);
+	fdt_compat = ofnode_get_property(ofnode_root(), "compatible",
+					 &fdt_compat_len);
 	if (fdt_compat && fdt_compat_len)
 		printf(" (%s)", fdt_compat);
 	puts("\n");