armv8: ls1088a: Unset USE_BOOTCOMMAND in defconfig

Unset USE_BOOTCOMMAND for all ls1088 defconfig files to fix
redefinition error. USE_BOOTCOMMAND was introduced in commit
b6251db8c3f ("Kconfig: Introduce USE_BOOTCOMMAND and migrate
BOOTCOMMAND").

Signed-off-by: Ashish Kumar <Ashish.Kumar@nxp.com>
Reviewed-by: York Sun <york.sun@nxp.com>
diff --git a/configs/ls1088aqds_sdcard_qspi_defconfig b/configs/ls1088aqds_sdcard_qspi_defconfig
index 214de54..8629800 100644
--- a/configs/ls1088aqds_sdcard_qspi_defconfig
+++ b/configs/ls1088aqds_sdcard_qspi_defconfig
@@ -14,6 +14,7 @@
 CONFIG_SYS_EXTRA_OPTIONS="SD_BOOT_QSPI"
 CONFIG_SD_BOOT=y
 # CONFIG_DISPLAY_BOARDINFO is not set
+# CONFIG_USE_BOOTCOMMAND is not set
 CONFIG_SPL=y
 CONFIG_SPL_BUILD=y
 CONFIG_SYS_MMCSD_RAW_MODE_U_BOOT_USE_SECTOR=y