Revert "Revert "nvram: increase NVRAM size to 64 KiB""

This reverts commit r45579.

With the latest change r46251 ("nvram: fix "Segmentation fault" caused
by setting memory out of buffer") nvram utility shouldn't crash anymore.

It was tested on 3 brcm47xx devices:
1) Unknown with 0x10000 NVRAM size (0x8000 offset)
2) Linksys E1000 V2.1 with 0x10000 (0x8000 offset)
3) Linksys WRT300N V1 with 0x10000 (0x8000 offset)

And 3 bcm53xx devices:
1) Buffalo WZR-600DHP2 with 0x160000 NVRAM size
2) Buffalo WZR-1750DHP with 0x10000 NVRAM size
3) Netgear R6250 V1 with 0x180000 NVRAM size
(all using 0 offset)

This is an important change as it allows reading whole NVRAM. This may
critical when reading some basic configuration (e.g. switch ports).

Signed-off-by: Rafał Miłecki <zajec5@gmail.com>

SVN-Revision: 46253

package/utils/nvram/src/nvram.h

@@ -114,7 +114,7 @@ char * nvram_find_staging(void);
 
 /* NVRAM constants */
 #define NVRAM_MIN_SPACE			0x8000
-#define NVRAM_SPACE			0x8000
+#define NVRAM_SPACE			0x10000
 #define NVRAM_MAGIC			0x48534C46	/* 'FLSH' */
 #define NVRAM_VERSION		1