linux: bump default to version 4.16

Added host-bison and host-flex as dependencies after upstream removed
pre-generated files and switched over to build-time generation, for
details see:

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=033dba2ec06c47a9fe1b190bc3281058fb20738d
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=29c833061c1d8c2d1d23a62e7061561eadd76cdb

Signed-off-by: Bernd Kuhls <bernd.kuhls@t-online.de>
Tested-by: Luca Ceresoli <luca@lucaceresoli.net>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

linux/Config.in

@@ -26,7 +26,7 @@ choice
 	prompt "Kernel version"
 
 config BR2_LINUX_KERNEL_LATEST_VERSION
-	bool "Latest version (4.15)"
+	bool "Latest version (4.16)"
 
 config BR2_LINUX_KERNEL_LATEST_CIP_VERSION
 	bool "Latest CIP SLTS version (v4.4.112-cip18)"
@@ -116,7 +116,7 @@ endif
 
 config BR2_LINUX_KERNEL_VERSION
 	string
-	default "4.15.16" if BR2_LINUX_KERNEL_LATEST_VERSION
+	default "4.16" if BR2_LINUX_KERNEL_LATEST_VERSION
 	default "v4.4.112-cip18" if BR2_LINUX_KERNEL_LATEST_CIP_VERSION
 	default BR2_LINUX_KERNEL_CUSTOM_VERSION_VALUE \
 		if BR2_LINUX_KERNEL_CUSTOM_VERSION

linux/linux.mk

@@ -62,7 +62,7 @@ LINUX_PATCHES = $(call qstrip,$(BR2_LINUX_KERNEL_PATCH))
 LINUX_PATCH = $(filter ftp://% http://% https://%,$(LINUX_PATCHES))
 
 LINUX_INSTALL_IMAGES = YES
-LINUX_DEPENDENCIES += host-kmod
+LINUX_DEPENDENCIES += host-bison host-flex host-kmod
 
 # host tools needed for kernel compression
 ifeq ($(BR2_LINUX_KERNEL_LZ4),y)