km/powerpc: increase space for kernel imange and FDT blob

128kByte and 3,986MB may be in the future too little for kernel the fdt
blob respectively the kernel image. So increase the reserved areas here,
we have the space for this.
Signed-off-by: NHolger Brunck <holger.brunck@keymile.com>
Signed-off-by: NValentin Longchamp <valentin.longchamp@keymile.com>

include/configs/km/km-powerpc.h

@@ -63,9 +63,9 @@
  * is not valid yet, which is the case for when u-boot copies itself to RAM */
 #define CONFIG_PRAM		((CONFIG_KM_PNVRAM + CONFIG_KM_PHRAM)>>10)
 
-#define CONFIG_KM_CRAMFS_ADDR	0x800000
-#define CONFIG_KM_KERNEL_ADDR	0x400000	/* 3968Kbytes */
-#define CONFIG_KM_FDT_ADDR	0x7E0000	/* 128Kbytes */
+#define CONFIG_KM_CRAMFS_ADDR	0xC00000
+#define CONFIG_KM_KERNEL_ADDR	0x400000	/* 7680Kbytes */
+#define CONFIG_KM_FDT_ADDR	0xB80000	/* 512Kbytes */
 
 /* architecture specific default bootargs */
 #define CONFIG_KM_DEF_BOOT_ARGS_CPU		""