linux: bump default to version 4.2

Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

linux/Config.in

@@ -21,7 +21,7 @@ choice
 	prompt "Kernel version"
 
 config BR2_LINUX_KERNEL_LATEST_VERSION
-	bool "4.1.5"
+	bool "4.2"
 
 config BR2_LINUX_KERNEL_SAME_AS_HEADERS
 	bool "Same as toolchain kernel headers"
@@ -109,7 +109,7 @@ config BR2_LINUX_KERNEL_CUSTOM_LOCAL_PATH
 
 config BR2_LINUX_KERNEL_VERSION
 	string
-	default "4.1.5" if BR2_LINUX_KERNEL_LATEST_VERSION
+	default "4.2" if BR2_LINUX_KERNEL_LATEST_VERSION
 	default BR2_DEFAULT_KERNEL_HEADERS if BR2_LINUX_KERNEL_SAME_AS_HEADERS
 	default BR2_LINUX_KERNEL_CUSTOM_VERSION_VALUE \
 		if BR2_LINUX_KERNEL_CUSTOM_VERSION