Update kspp-recommendations.config to look like an x86_64 config

Add a header that will make the checker script think that it is dealing
with a x86_64 config file. Additionally, update the stackprotector
related options to reflect the >= 4.18 names.

Signed-off-by: Tyler Hicks <tyhicks@canonical.com>

config_files/kspp-recommendations.config

 # CONFIGs
+# Linux/x86_64 4.20 Kernel Configuration
 
 # Report BUG() conditions and kill the offending process.
 CONFIG_BUG=y
@@ -10,8 +11,8 @@ CONFIG_STRICT_KERNEL_RWX=y
 CONFIG_DEBUG_WX=y
 
 # Use -fstack-protector-strong (gcc 4.9+) for best stack canary coverage.
-CONFIG_CC_STACKPROTECTOR=y
-CONFIG_CC_STACKPROTECTOR_STRONG=y
+CONFIG_STACKPROTECTOR=y
+CONFIG_STACKPROTECTOR_STRONG=y
 
 # Do not allow direct physical memory access (but if you must have it, at least enable STRICT mode...)
 # CONFIG_DEVMEM is not set