cmd: irq: disable CMD_IRQ for riscv arch

For RISC-V arch, no need for CMD_IRQ so disable the same.

Signed-off-by: Pragnesh Patel <pragnesh.patel@sifive.com>
Reviewed-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Reviewed-by: Rick Chen <rick@andestech.com>
Reviewed-by: Bin Meng <bin.meng@windriver.com>
diff --git a/cmd/Kconfig b/cmd/Kconfig
index 0c984d7..30c358d 100644
--- a/cmd/Kconfig
+++ b/cmd/Kconfig
@@ -2235,7 +2235,7 @@
 
 config CMD_IRQ
 	bool "irq - Show information about interrupts"
-	depends on !ARM && !MIPS && !SH
+	depends on !ARM && !MIPS && !RISCV && !SH
 	help
 	  This enables two commands: