Remove now unused Config.in for kernel selection

It's now linux/Config.in that allows to configure the kernel
configuration/compilation.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

target/Config.in

@@ -1,50 +0,0 @@
-menu "Kernel"
-choice
-	prompt "Kernel type"
-	default BR2_KERNEL_none
-
-config BR2_KERNEL_none
-	bool "none"
-	help
-	  Do not build a kernel
-
-config BR2_KERNEL_LINUX_ADVANCED
-	bool "linux (Advanced configuration)"
-	select BR2_PACKAGE_LINUX
-	help
-	  The Linux kernel - Advanced Configuration.
-	  http://www.kernel.org/
-
-	  Note: Requires kernel-headers >= 2.6.19 since the other
-	        kernel headers are just that (headers) and not full
-	        kernels. This is a feature.
-
-# The kernel with the same version as linux headers cannot be compiled
-# when using an external toolchain, because the linux headers are not
-# handled by Buildroot in this case.
-if BR2_TOOLCHAIN_BUILDROOT
-
-config BR2_KERNEL_LINUX
-	bool "linux (Same version as linux headers)"
-	select BR2_PACKAGE_LINUX
-	help
-	  The Linux kernel.
-	  http://www.kernel.org/
-
-	  Note: Requires kernel-headers >= 2.6.19 since the other
-	        kernel headers are just that (headers) and not full
-	        kernels. This is a feature.
-
-endif
-
-endchoice
-
-config BR2_PACKAGE_LINUX
-	bool
-
-if BR2_PACKAGE_LINUX
-source "target/linux/Config.in"
-source "target/linux/Config.in.advanced"
-endif
-
-endmenu