integrity: digital signature config option name change

Similar to SIGNATURE, rename INTEGRITY_DIGSIG to INTEGRITY_SIGNATURE.

Signed-off-by: Dmitry Kasatkin <dmitry.kasatkin@intel.com>
Signed-off-by: James Morris <jmorris@namei.org>
diff --git a/security/integrity/Kconfig b/security/integrity/Kconfig
index ff60bf7..5bd1cc1 100644
--- a/security/integrity/Kconfig
+++ b/security/integrity/Kconfig
@@ -3,7 +3,7 @@
 	def_bool y
 	depends on IMA || EVM
 
-config INTEGRITY_DIGSIG
+config INTEGRITY_SIGNATURE
 	boolean "Digital signature verification using multiple keyrings"
 	depends on INTEGRITY && KEYS
 	default n