Move certificate handling to its own directory

Move certificate handling out of the kernel/ directory and into a certs/
directory to get all the weird stuff in one place and move the generated
signing keys into this directory.

Signed-off-by: David Howells <dhowells@redhat.com>
Reviewed-by: David Woodhouse <David.Woodhouse@intel.com>
diff --git a/crypto/Kconfig b/crypto/Kconfig
index b4cfc57..51b01de7 100644
--- a/crypto/Kconfig
+++ b/crypto/Kconfig
@@ -1601,5 +1601,6 @@
 
 source "drivers/crypto/Kconfig"
 source crypto/asymmetric_keys/Kconfig
+source certs/Kconfig
 
 endif	# if CRYPTO