stm32mp1: platform: update st version to r1.4

Change-Id: I3d9dbaa0d7cf7756140545b9b17fcebd9412d834
Signed-off-by: Nicolas Le Bayon <nicolas.le.bayon@st.com>

Author: nlebayon

plat/st/stm32mp1/platform.mk

@@ -11,7 +11,7 @@ USE_COHERENT_MEM	:=	0
 MULTI_CONSOLE_API	:=	1
 
 # Add specific ST version
-ST_VERSION 		:=	r1.3
+ST_VERSION 		:=	r1.4
 VERSION_STRING		:=	v${VERSION_MAJOR}.${VERSION_MINOR}-${ST_VERSION}(${BUILD_TYPE}):${BUILD_STRING}
 
 # Please don't increment this value without good understanding of