feat(stm32mp1): manage STM32MP13 rev.Y

The new SoC version for STM32MP13 is the revision Y. The register
SYSCFG_IDC is updated for this new version with the value 0x1003.
The function stm32mp_get_soc_name() should also be updated to manage
this new SoC revision.

Signed-off-by: Yann Gautier <yann.gautier@foss.st.com>
Change-Id: I4f2fa5f1503f17db93d8413c79c2b7a18d279f9b
diff --git a/plat/st/stm32mp1/stm32mp1_def.h b/plat/st/stm32mp1/stm32mp1_def.h
index 8ca6123..542895a 100644
--- a/plat/st/stm32mp1/stm32mp1_def.h
+++ b/plat/st/stm32mp1/stm32mp1_def.h
@@ -71,6 +71,7 @@
 
 #define STM32MP1_REV_B		U(0x2000)
 #if STM32MP13
+#define STM32MP1_REV_Y		U(0x1003)
 #define STM32MP1_REV_Z		U(0x1001)
 #endif
 #if STM32MP15