nvram: increase NVRAM size to 64 KiB

For years Broadcom devices use 64 KiB NVRAM partition size and some of
them indeed have it filled in more than 50%. This change allows handling
whole NVRAM e.g. on Netgear WNDR4500 and Netgear R8000.

The same fix was applied to kernel in upstream commit 6ab7c29.

Reported-by: Hante Meuleman <meuleman@broadcom.com>
Signed-off-by: Rafał Miłecki <zajec5@gmail.com>

SVN-Revision: 45566

package/utils/nvram/src/nvram.h

@@ -113,7 +113,7 @@ char * nvram_find_staging(void);
 #define	NVRAM_ROUNDUP(x, y)	((((x)+((y)-1))/(y))*(y))
 
 /* NVRAM constants */
-#define NVRAM_SPACE			0x8000
+#define NVRAM_SPACE			0x10000
 #define NVRAM_MAGIC			0x48534C46	/* 'FLSH' */
 #define NVRAM_VERSION		1