arm: socfpga: Enabling U-Boot environment support in QSPI

Enabling the support of storing U-Boot environment
within serial NOR flash. By default, its still
store into SDMMC

Signed-off-by: Chin Liang See <clsee@altera.com>
Cc: Dinh Nguyen <dinguyen@opensource.altera.com>
Cc: Dinh Nguyen <dinh.linux@gmail.com>
Cc: Pavel Machek <pavel@denx.de>
Cc: Marek Vasut <marex@denx.de>
Cc: Stefan Roese <sr@denx.de>

include/configs/socfpga_common.h

@@ -292,6 +292,12 @@ unsigned int cm_get_qspi_controller_clk_hz(void);
 #define CONFIG_ENV_OFFSET		512	/* just after the MBR */
 #endif
 
+/* Environment for QSPI boot */
+#if defined(CONFIG_ENV_IS_IN_SPI_FLASH) && !defined(CONFIG_ENV_OFFSET)
+#define CONFIG_ENV_OFFSET		0x00100000
+#define CONFIG_ENV_SECT_SIZE		(64 * 1024)
+#endif
+
 /*
  * mtd partitioning for serial NOR flash
  *