stm32mp1: platform: update st version to r2.2

Signed-off-by: vermaash <ashish.verma@st.com>

Author: ashishverma2691

plat/st/stm32mp1/platform.mk

@@ -14,7 +14,7 @@ STM32MP_RECONFIGURE_CONSOLE ?=	0
 STM32MP_UART_BAUDRATE	?=	115200
 
 # Add specific ST version
-ST_VERSION 		:=	r2.1
+ST_VERSION 		:=	r2.2
 ST_GIT_SHA1		:=	$(shell git rev-parse --short=8 HEAD 2>/dev/null)
 VERSION_STRING		:=	v${VERSION_MAJOR}.${VERSION_MINOR}-${PLAT}-${ST_VERSION}(${BUILD_TYPE}):${BUILD_STRING}(${ST_GIT_SHA1})