imx: hab: use unified rom section for mx6sx and mx6ul

Add CONFIG_ROM_UNIFIED_SECTIONS for mx6sx and mx6ul target
platforms to resolve corresponding HAB_RVT_BASE base address,
the RVT table contains pointers to the HAB API functions in
ROM code.

Signed-off-by: Adrian Alonso <aalonso@freescale.com>

arch/arm/cpu/armv7/mx6/Kconfig

@@ -23,10 +23,12 @@ config MX6SL
 	bool
 
 config MX6SX
+	select ROM_UNIFIED_SECTIONS
 	bool
 
 config MX6UL
 	select SYS_L2CACHE_OFF
+	select ROM_UNIFIED_SECTIONS
 	bool
 
 choice

arch/arm/imx-common/Kconfig

 config IMX_CONFIG
 	string
+
+config ROM_UNIFIED_SECTIONS
+	bool

arch/arm/include/asm/imx-common/hab.h

@@ -113,7 +113,7 @@ typedef void hapi_clock_init_t(void);
 #define HAB_ENG_RTL		0x77   /* RTL simulation engine */
 #define HAB_ENG_SW		0xff   /* Software engine */
 
-#ifdef CONFIG_MX6SX
+#ifdef CONFIG_ROM_UNIFIED_SECTIONS
 #define HAB_RVT_BASE			0x00000100
 #else
 #define HAB_RVT_BASE			0x00000094