ARM: rmobile: rcar-gen2: Activate bootm_size

Commit d245059ff797 ("ARM: rmobile: rcar-gen3: Activate bootm_size")
only fixed the superfluous CONFIG_SYS_BOOTMAPSZ for R-Car Gen3, even
though it listed all affected boards. Apply the same fix to Gen2.

Signed-off-by: Marek Vasut <marek.vasut+renesas@gmail.com>
Fixes: d245059ff797 ("ARM: rmobile: rcar-gen3: Activate bootm_size")
Cc: Eugeniu Rosca <erosca@de.adit-jv.com>
diff --git a/include/configs/rcar-gen2-common.h b/include/configs/rcar-gen2-common.h
index 9213d33..7f72ff2 100644
--- a/include/configs/rcar-gen2-common.h
+++ b/include/configs/rcar-gen2-common.h
@@ -38,7 +38,6 @@
 #define CONFIG_SYS_MONITOR_BASE		0x00000000
 #define CONFIG_SYS_MONITOR_LEN		(256 * 1024)
 #define CONFIG_SYS_MALLOC_LEN		(1 * 1024 * 1024)
-#define CONFIG_SYS_BOOTMAPSZ		(8 * 1024 * 1024)
 
 /* ENV setting */
 #define CONFIG_ENV_ADDR	0xC0000