linux: bump default to version 4.8

Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

linux/Config.in

@@ -26,7 +26,7 @@ choice
 	prompt "Kernel version"
 
 config BR2_LINUX_KERNEL_LATEST_VERSION
-	bool "Latest version (4.7.6)"
+	bool "Latest version (4.8)"
 
 config BR2_LINUX_KERNEL_CUSTOM_VERSION
 	bool "Custom version"
@@ -97,7 +97,7 @@ endif
 
 config BR2_LINUX_KERNEL_VERSION
 	string
-	default "4.7.6" if BR2_LINUX_KERNEL_LATEST_VERSION
+	default "4.8" if BR2_LINUX_KERNEL_LATEST_VERSION
 	default BR2_LINUX_KERNEL_CUSTOM_VERSION_VALUE \
 		if BR2_LINUX_KERNEL_CUSTOM_VERSION
 	default "custom" if BR2_LINUX_KERNEL_CUSTOM_TARBALL