ARM: stm32mp: correctly handle Silicon revision

Handle correctly the silicon revision = REV_ID[15:0] of Device Version
and the associated device marking, A to Z on STMicroelectronics STM32MP
SOCs.

This patch prepare the introduction of next STM32MP family,
with STM32MP13x Rev.Z for REV_ID = 1.1.

Signed-off-by: Patrick Delaunay <patrick.delaunay@foss.st.com>
Reviewed-by: Patrice Chotard <patrice.chotard@foss.st.com>
Signed-off-by: Patrice Chotard <patrice.chotard@foss.st.com>
diff --git a/arch/arm/mach-stm32mp/cpu.c b/arch/arm/mach-stm32mp/cpu.c
index 325d710..0ad5f30 100644
--- a/arch/arm/mach-stm32mp/cpu.c
+++ b/arch/arm/mach-stm32mp/cpu.c
@@ -432,13 +432,13 @@
 
 	/* Revision */
 	switch (get_cpu_rev()) {
-	case CPU_REVA:
+	case CPU_REV1:
 		*rev = 1;
 		break;
-	case CPU_REVB:
+	case CPU_REV2:
 		*rev = 2;
 		break;
-	case CPU_REVZ:
+	case CPU_REV2_1:
 		*rev = 3;
 		break;
 	default: