Merge tag 'arc-updates-for-2018.09-rc2' of git://git.denx.de/u-boot-arc

That's a set of prety minor changes and fixes for ARC.

Among them:
 * Improvement in CREG GPIO driver used on ARC dev boards
   that allow us to re-use the driver for SPI's chip select

 * Enable SPI-flsh on AXS10x boards which allows to update
   U-Boot binary that gets loaded by boot-ROM

 * Fix accommodating always utilized unaligned access by
   GCC for ARC starting from 8.1.0

include/configs/axs10x.h

@@ -65,6 +65,13 @@
  * Environment settings
  */
 #define CONFIG_ENV_SIZE			SZ_16K
+#define CONFIG_EXTRA_ENV_SETTINGS \
+	"upgrade=if mmc rescan && " \
+		"fatload mmc 0:1 ${loadaddr} u-boot-update.img && " \
+		"iminfo ${loadaddr} && source ${loadaddr}; then; else echo " \
+		"\"Fail to upgrade.\n" \
+		"Do you have u-boot-update.img and u-boot.head on first (FAT) SD card partition?\"" \
+		"; fi\0"
 
 /*
  * Environment configuration