cmd: Move CONFIG_RANDOM_UUID to Kconfig

CONFIG_RANDOM_UUID is used by the GPT command to generate random UUID when
none are provided.

Move that option to Kconfig.

Reviewed-by: Tom Rini <trini@konsulko.com>
Reviewed-by: Jagan Teki <jagan@openedev.com>
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
diff --git a/configs/rock_defconfig b/configs/rock_defconfig
index aaf2775..599760d 100644
--- a/configs/rock_defconfig
+++ b/configs/rock_defconfig
@@ -14,6 +14,7 @@
 CONFIG_SPL_STACK_R=y
 CONFIG_SPL_STACK_R_MALLOC_SIMPLE_LEN=0x2000
 # CONFIG_CMD_IMLS is not set
+CONFIG_RANDOM_UUID=y
 CONFIG_CMD_I2C=y
 CONFIG_CMD_MMC=y
 CONFIG_CMD_SF=y