crypto: sha256 - Move lib/sha256.c to lib/crypto

Generic crypto implementations belong under lib/crypto not directly in
lib, likewise the header should be in include/crypto, not include/linux.

Note that the code in lib/crypto/sha256.c is not yet available for
generic use after this commit, it is still only used by the s390 and x86
purgatory code. Making it suitable for generic use is done in further
patches in this series.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

arch/s390/purgatory/Makefile

@@ -7,7 +7,7 @@ purgatory-y := head.o purgatory.o string.o sha256.o mem.o
 targets += $(purgatory-y) purgatory.lds purgatory purgatory.ro
 PURGATORY_OBJS = $(addprefix $(obj)/,$(purgatory-y))
 
-$(obj)/sha256.o: $(srctree)/lib/sha256.c FORCE
+$(obj)/sha256.o: $(srctree)/lib/crypto/sha256.c FORCE
 	$(call if_changed_rule,cc_o_c)
 
 $(obj)/mem.o: $(srctree)/arch/s390/lib/mem.S FORCE

arch/s390/purgatory/purgatory.c

@@ -8,8 +8,8 @@
  */
 
 #include <linux/kexec.h>
-#include <linux/sha256.h>
 #include <linux/string.h>
+#include <crypto/sha256.h>
 #include <asm/purgatory.h>
 
 int verify_sha256_digest(void)

arch/x86/purgatory/Makefile

@@ -6,7 +6,7 @@ purgatory-y := purgatory.o stack.o setup-x86_$(BITS).o sha256.o entry64.o string
 targets += $(purgatory-y)
 PURGATORY_OBJS = $(addprefix $(obj)/,$(purgatory-y))
 
-$(obj)/sha256.o: $(srctree)/lib/sha256.c FORCE
+$(obj)/sha256.o: $(srctree)/lib/crypto/sha256.c FORCE
 	$(call if_changed_rule,cc_o_c)
 
 LDFLAGS_purgatory.ro := -e purgatory_start -r --no-undefined -nostdlib -z nodefaultlib

arch/x86/purgatory/purgatory.c

@@ -9,7 +9,7 @@
  */
 
 #include <linux/bug.h>
-#include <linux/sha256.h>
+#include <crypto/sha256.h>
 #include <asm/purgatory.h>
 
 #include "../boot/string.h"

include/crypto/sha256.h

@@ -17,7 +17,7 @@
  * kexec_file purgatory. In other cases you should use the implementation in
  * crypto/.
  *
- * For details see lib/sha256.c
+ * For details see lib/crypto/sha256.c
  */
 
 extern int sha256_init(struct sha256_state *sctx);

lib/crypto/sha256.c

@@ -12,8 +12,8 @@
  */
 
 #include <linux/bitops.h>
-#include <linux/sha256.h>
 #include <linux/string.h>
+#include <crypto/sha256.h>
 #include <asm/byteorder.h>
 
 static inline u32 Ch(u32 x, u32 y, u32 z)