lib: crypto: allow to build crypyo in SPL

This commit adds the options:
- SPL_ASYMMETRIC_KEY_TYPE
- SPL_ASYMMETRIC_PUBLIC_KEY_SUBTYPE
- SPL_RSA_PUBLIC_KEY_PARSER

Reviewed-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Philippe Reynes <philippe.reynes@softathome.com>
diff --git a/lib/crypto/Makefile b/lib/crypto/Makefile
index f3a4145..6792b1d 100644
--- a/lib/crypto/Makefile
+++ b/lib/crypto/Makefile
@@ -3,27 +3,34 @@
 # Makefile for asymmetric cryptographic keys
 #
 
-obj-$(CONFIG_ASYMMETRIC_KEY_TYPE) += asymmetric_keys.o
+obj-$(CONFIG_$(SPL_)ASYMMETRIC_KEY_TYPE) += asymmetric_keys.o
 
 asymmetric_keys-y := asymmetric_type.o
 
-obj-$(CONFIG_ASYMMETRIC_PUBLIC_KEY_SUBTYPE) += public_key.o
+obj-$(CONFIG_$(SPL_)ASYMMETRIC_PUBLIC_KEY_SUBTYPE) += public_key.o
 
 #
 # RSA public key parser
 #
-obj-$(CONFIG_RSA_PUBLIC_KEY_PARSER) += rsa_public_key.o
+obj-$(CONFIG_$(SPL_)RSA_PUBLIC_KEY_PARSER) += rsa_public_key.o
 rsa_public_key-y := \
 	rsapubkey.asn1.o \
 	rsa_helper.o
 
 $(obj)/rsapubkey.asn1.o: $(obj)/rsapubkey.asn1.c $(obj)/rsapubkey.asn1.h
+ifdef CONFIG_SPL_BUILD
+CFLAGS_rsapubkey.asn1.o += -I$(obj)
+endif
+
 $(obj)/rsa_helper.o: $(obj)/rsapubkey.asn1.h
+ifdef CONFIG_SPL_BUILD
+CFLAGS_rsa_helper.o += -I$(obj)
+endif
 
 #
 # X.509 Certificate handling
 #
-obj-$(CONFIG_X509_CERTIFICATE_PARSER) += x509_key_parser.o
+obj-$(CONFIG_$(SPL_)X509_CERTIFICATE_PARSER) += x509_key_parser.o
 x509_key_parser-y := \
 	x509.asn1.o \
 	x509_akid.asn1.o \
@@ -40,11 +47,11 @@
 #
 # PKCS#7 message handling
 #
-obj-$(CONFIG_PKCS7_MESSAGE_PARSER) += pkcs7_message.o
+obj-$(CONFIG_$(SPL_)PKCS7_MESSAGE_PARSER) += pkcs7_message.o
 pkcs7_message-y := \
 	pkcs7.asn1.o \
 	pkcs7_parser.o
-obj-$(CONFIG_PKCS7_VERIFY) += pkcs7_verify.o
+obj-$(CONFIG_$(SPL_)PKCS7_VERIFY) += pkcs7_verify.o
 
 $(obj)/pkcs7_parser.o: $(obj)/pkcs7.asn1.h
 $(obj)/pkcs7.asn1.o: $(obj)/pkcs7.asn1.c $(obj)/pkcs7.asn1.h