x86: kconfig: Allow board defconfig file to disable 8259 and APIC

At present the Kconfig options (CONFIG_I8259_PIC and CONFIG_APIC)
do not include a prompt message, which makes it impossible to
be disabled from a board defconfig file.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 8fc9187..e052093 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -729,7 +729,7 @@
 	  maximum number of PCI buses as defined by the PCI specification.
 
 config I8259_PIC
-	bool
+	bool "Enable Intel 8259 compatible interrupt controller"
 	default y
 	help
 	  Intel 8259 ISA compatible chipset incorporates two 8259 (master and
@@ -737,7 +737,7 @@
 	  the interrupt correctly.
 
 config APIC
-	bool
+	bool "Enable Intel Advanced Programmable Interrupt Controller"
 	default y
 	help
 	  The (A)dvanced (P)rogrammable (I)nterrupt (C)ontroller is responsible