arm/km: disable subpage write for km_kirkwood_pci and kmsuv31 target

Newer FLASH types used on these boards don't allow writing of subpages.
So disable subpage write in the NAND driver. Additionally we need to
tell the UBI layer in the kernel that he also should only write 2048
bytes. This is done with an additional command line parameter for the
kernel commandline.
Signed-off-by: NHolger Brunck <holger.brunck@keymile.com>
cc: Valentin Longchamp <valentin.longchamp@keymile.com>
cc: Prafulla Wadaskar <prafulla@marvell.com>

include/configs/km_kirkwood.h

@@ -34,6 +34,8 @@
 #define CONFIG_HOSTNAME			km_kirkwood_pci
 #define CONFIG_KM_IVM_BUS		1	/* I2C2 (Mux-Port 1)*/
 #define CONFIG_KM_FPGA_CONFIG
+#define CONFIG_KM_UBI_PART_BOOT_OPTS		",2048"
+#define CONFIG_SYS_NAND_NO_SUBPAGE_WRITE
 
 /* KM_KIRKWOOD_128M16 */
 #elif defined(CONFIG_KM_KIRKWOOD_128M16)
@@ -105,7 +107,8 @@
 #define CONFIG_SYS_KWD_CONFIG $(CONFIG_BOARDDIR)/kwbimage_128M16_1.cfg
 #define CONFIG_KM_ENV_IS_IN_SPI_NOR
 #define CONFIG_KM_FPGA_CONFIG
-
+#define CONFIG_KM_UBI_PART_BOOT_OPTS		",2048"
+#define CONFIG_SYS_NAND_NO_SUBPAGE_WRITE
 #else
 #error ("Board unsupported")
 #endif