configs: socfpga: soc64: Move CONFIG_BOOTCOMMAND to defconfig

CONFIG_BOOTCOMMAND have been moved to Kconfig.boot. This patch
move the CONFIG_BOOTCOMMAND macro from socfpga_soc64_common.h to
*_defconfig file for both Stratix 10 and Agilex.

Signed-off-by: Siew Chin Lim <elly.siew.chin.lim@intel.com>
diff --git a/include/configs/socfpga_soc64_common.h b/include/configs/socfpga_soc64_common.h
index fdcd7d3..0e54601 100644
--- a/include/configs/socfpga_soc64_common.h
+++ b/include/configs/socfpga_soc64_common.h
@@ -79,19 +79,13 @@
 #endif /* CONFIG_CADENCE_QSPI */
 
 /*
- * Boot arguments passed to the boot command. The value of
- * CONFIG_BOOTARGS goes into the environment value "bootargs".
- * Do note the value will override also the chosen node in FDT blob.
+ * Environment variable
  */
 
 #ifdef CONFIG_FIT
 #define CONFIG_BOOTFILE "kernel.itb"
-#define CONFIG_BOOTCOMMAND "run fatscript; run mmcfitload;run linux_qspi_enable;" \
-			   "run mmcfitboot"
 #else
 #define CONFIG_BOOTFILE "Image"
-#define CONFIG_BOOTCOMMAND "run fatscript; run mmcload;run linux_qspi_enable;" \
-			   "run mmcboot"
 #endif
 
 #define CONFIG_EXTRA_ENV_SETTINGS \