crypto: lib - add missing MODULE_DESCRIPTION() macros

With ARCH=arm, make allmodconfig && make W=1 C=1 reports:
WARNING: modpost: missing MODULE_DESCRIPTION() in lib/crypto/libsha256.o

Add the missing invocation of the MODULE_DESCRIPTION() macro to all
files which have a MODULE_LICENSE().

This includes sha1.c and utils.c which, although they did not produce
a warning with the arm allmodconfig configuration, may cause this
warning with other configurations.
Signed-off-by: Jeff Johnson <quic_jjohnson@quicinc.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

lib/crypto/sha1.c

@@ -137,4 +137,5 @@ void sha1_init(__u32 *buf)
 }
 EXPORT_SYMBOL(sha1_init);
 
+MODULE_DESCRIPTION("SHA-1 Algorithm");
 MODULE_LICENSE("GPL");

lib/crypto/sha256.c

@@ -165,4 +165,5 @@ void sha256(const u8 *data, unsigned int len, u8 *out)
 }
 EXPORT_SYMBOL(sha256);
 
+MODULE_DESCRIPTION("SHA-256 Algorithm");
 MODULE_LICENSE("GPL");

lib/crypto/utils.c

@@ -85,4 +85,5 @@ void __crypto_xor(u8 *dst, const u8 *src1, const u8 *src2, unsigned int len)
 }
 EXPORT_SYMBOL_GPL(__crypto_xor);
 
+MODULE_DESCRIPTION("Crypto library utility functions");
 MODULE_LICENSE("GPL");