openssl: Fix detection of ARMv7 and ARM64 CPU features

OpenSSL assumes the same value for AT_HWCAP=16 (Linux)
So it ends up calling elf_auxv_info() with AT_CANARY which
returns ENOENT, and all acceleration features are disabled.

With this, my ARM64 test machine runs the benchmark
`openssl speed -evp aes-256-gcm` nearly 20x faster
going from 100 MB/sec to 2000 MB/sec

It also improves sha256 from 300 MB/sec to 1800 MB/sec

This fix has been accepted but not yet merged upstream:
https://github.com/openssl/openssl/pull/17082

PR:		259937
Reviewed by:	manu, imp
MFC after:	immediate
Relnotes:	yes
Fixes:		88e852c0b5 ("OpenSSL: Merge OpenSSL 1.1.1j")
Sponsored by:	Ampere Computing LLC
Sponsored by:	Klara Inc.
Differential Revision:	https://reviews.freebsd.org/D33060

crypto/openssl/crypto/armcap.c

@@ -106,20 +106,23 @@ static unsigned long getauxval(unsigned long key)
  * ARM puts the feature bits for Crypto Extensions in AT_HWCAP2, whereas
  * AArch64 used AT_HWCAP.
  */
+# ifndef AT_HWCAP
+#  define AT_HWCAP               16
+# endif
+# ifndef AT_HWCAP2
+#  define AT_HWCAP2              26
+# endif
 # if defined(__arm__) || defined (__arm)
-#  define HWCAP                  16
-                                  /* AT_HWCAP */
+#  define HWCAP                  AT_HWCAP
 #  define HWCAP_NEON             (1 << 12)
 
-#  define HWCAP_CE               26
-                                  /* AT_HWCAP2 */
+#  define HWCAP_CE               AT_HWCAP2
 #  define HWCAP_CE_AES           (1 << 0)
 #  define HWCAP_CE_PMULL         (1 << 1)
 #  define HWCAP_CE_SHA1          (1 << 2)
 #  define HWCAP_CE_SHA256        (1 << 3)
 # elif defined(__aarch64__)
-#  define HWCAP                  16
-                                  /* AT_HWCAP */
+#  define HWCAP                  AT_HWCAP
 #  define HWCAP_NEON             (1 << 1)
 
 #  define HWCAP_CE               HWCAP