x86: disable crashlog

It could cause crashes with some forms of virtualization, and it is
unlikely to work properly with most systems.
It's safer to just disable it.

Signed-off-by: Felix Fietkau <nbd@nbd.name>

config/Config-kernel.in

@@ -26,7 +26,7 @@ config KERNEL_PRINTK
 
 config KERNEL_CRASHLOG
 	bool "Crash logging"
-	depends on !(arm || powerpc || sparc || TARGET_uml)
+	depends on !(arm || powerpc || sparc || TARGET_uml || i386 || x86_64)
 	default y
 
 config KERNEL_SWAP

target/linux/x86/config-4.4

@@ -79,6 +79,7 @@ CONFIG_CPU_SUP_CYRIX_32=y
 CONFIG_CPU_SUP_INTEL=y
 CONFIG_CPU_SUP_TRANSMETA_32=y
 CONFIG_CPU_SUP_UMC_32=y
+# CONFIG_CRASHLOG is not set
 CONFIG_CRC16=y
 CONFIG_CRYPTO_AES_586=y
 CONFIG_CRYPTO_CRC32C=y