nvmem: u-boot-env:: Replace zero-length array with DECLARE_FLEX_ARRAY() helper

We are moving toward replacing zero-length arrays with C99 flexible-array
members since they are deprecated. Therefore, the new DECLARE_FLEX_ARRAY()
helper macro should be used to replace the zero-length array declaration.

This fixes warnings such as:
./drivers/nvmem/u-boot-env.c:50:9-13: WARNING use flexible-array member instead (https://www.kernel.org/doc/html/latest/process/deprecated.html#zero-length-and-one-element-arrays)

Signed-off-by: Atul Raut <rauji.raut@gmail.com>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Link: https://lore.kernel.org/r/20230823132744.350618-19-srinivas.kandagatla@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Author: atulraut

drivers/nvmem/u-boot-env.c

@@ -47,7 +47,7 @@ struct u_boot_env_image_broadcom {
 	__le32 magic;
 	__le32 len;
 	__le32 crc32;
-	uint8_t data[0];
+	DECLARE_FLEX_ARRAY(uint8_t, data);
 } __packed;
 
 static int u_boot_env_read(void *context, unsigned int offset, void *val,