wolfssl: update to 4.4.0-stable

This version adds many bugfixes, including a couple of security
vulnerabilities:
 - For fast math (enabled by wpa_supplicant option), use a constant time
   modular inverse when mapping to affine when operation involves a
   private key - keygen, calc shared secret, sign.
 - Change constant time and cache resistant ECC mulmod. Ensure points
   being operated on change to make constant time.

Signed-off-by: Eneas U de Queiroz <cotequeiroz@gmail.com>

package/libs/wolfssl/Makefile

@@ -8,12 +8,12 @@
 include $(TOPDIR)/rules.mk
 
 PKG_NAME:=wolfssl
-PKG_VERSION:=4.3.0-stable
+PKG_VERSION:=4.4.0-stable
 PKG_RELEASE:=1
 
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.gz
 PKG_SOURCE_URL:=https://github.com/wolfSSL/wolfssl/archive/v$(PKG_VERSION)
-PKG_HASH:=6896f8ad6c44aff3e583006eeee839600848a0e37118ebbb7514eca9409ae08b
+PKG_HASH:=7f854804c8ae0ca49cc77809e38e9a3b5a8c91ba7855ea928e6d6651b0d35f18
 
 PKG_FIXUP:=libtool
 PKG_INSTALL:=1