Convert CONFIG_CMD_IRQ to Kconfig

This converts the following to Kconfig:
   CONFIG_CMD_IRQ

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Tom Rini <trini@konsulko.com>
diff --git a/configs/socrates_defconfig b/configs/socrates_defconfig
index 940c24e..5def6d5 100644
--- a/configs/socrates_defconfig
+++ b/configs/socrates_defconfig
@@ -17,11 +17,12 @@
 # CONFIG_CMD_NFS is not set
 CONFIG_CMD_MII=y
 CONFIG_CMD_PING=y
-# CONFIG_CMD_HASH is not set
 CONFIG_CMD_SNTP=y
 CONFIG_CMD_BMP=y
 CONFIG_CMD_DATE=y
+# CONFIG_CMD_HASH is not set
 CONFIG_CMD_EXT2=y
+# CONFIG_CMD_IRQ is not set
 # CONFIG_MMC is not set
 CONFIG_MTD_NOR_FLASH=y
 CONFIG_SYS_NS16550=y