enable kernel choice for toolchain targets

target/config/Config.in.kernelversion.choice

@@ -3,7 +3,7 @@
 
 choice
 prompt "Kernel Version"
-depends on !ADK_TOOLCHAIN_ONLY && !ADK_CHOOSE_TARGET_ARCH && !ADK_CHOOSE_TARGET_SYSTEM && ADK_TARGET_KERNEL_CUSTOMISING
+depends on !ADK_CHOOSE_TARGET_ARCH && !ADK_CHOOSE_TARGET_SYSTEM && ADK_TARGET_KERNEL_CUSTOMISING
 default ADK_KERNEL_VERSION_3_14_4
 
 config ADK_KERNEL_VERSION_3_15_RC7