subsys: nvs: increase NVS_BLOCK_SIZE

The Atmel SAM E70 flash has a 16-byte write block size. Increase the
NVS_BLOCK_SIZE a bit and take some margin. This might also improve the
performances by reducing the calls to the flash driver when moving data
during garbage collection.

Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>

subsys/fs/nvs/nvs_priv.h

@@ -26,7 +26,7 @@ extern "C" {
  */
 #define NVS_STATUS_NOSPACE 1
 
-#define NVS_BLOCK_SIZE 8
+#define NVS_BLOCK_SIZE 32
 
 /* Allocation Table Entry */
 struct nvs_ate {