nvmem: u-boot-env: fix crc32 casting type

This fixes:
drivers/nvmem/u-boot-env.c:141:17: sparse: sparse: cast to restricted __le32

Fixes: d5542923f200 ("nvmem: add driver handling U-Boot environment variables")
Reported-by: kernel test robot <[e-mail]>
Signed-off-by: Rafał Miłecki <[e-mail]>
Signed-off-by: Srinivas Kandagatla <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/nvmem/u-boot-env.c

···
 		data_offset = offsetof(struct u_boot_env_image_redundant, data);
 		break;
 	}
-	crc32 = le32_to_cpu(*(uint32_t *)(buf + crc32_offset));
+	crc32 = le32_to_cpu(*(__le32 *)(buf + crc32_offset));
 	crc32_data_len = priv->mtd->size - crc32_data_offset;
 	data_len = priv->mtd->size - data_offset;