stm32mp: add setup_serial_number for stm32mp25

Add support of serial number for stm32mp25, gets from OTP with BSEC driver.

Reviewed-by: Patrice Chotard <patrice.chotard@foss.st.com>
Signed-off-by: Patrice Chotard <patrice.chotard@foss.st.com>
Signed-off-by: Patrick Delaunay <patrick.delaunay@foss.st.com>
Reviewed-by: Igor Opaniuk <igor.opaniuk@foundries.io>
diff --git a/arch/arm/mach-stm32mp/stm32mp2/cpu.c b/arch/arm/mach-stm32mp/stm32mp2/cpu.c
index c0f6519..301e365 100644
--- a/arch/arm/mach-stm32mp/stm32mp2/cpu.c
+++ b/arch/arm/mach-stm32mp/stm32mp2/cpu.c
@@ -69,6 +69,8 @@
 
 int arch_misc_init(void)
 {
+	setup_serial_number();
+
 	return 0;
 }