Change constant name from algo len to key len

Simple naming change to better describe the variable

Test: Ran unit tests
Bug: N/A
Change-Id: I2eb4c3a75f7f3ab6c9a09562a190fe81509b0fc7
diff --git a/server/XfrmController.h b/server/XfrmController.h
index eb43671..267edde 100644
--- a/server/XfrmController.h
+++ b/server/XfrmController.h
@@ -154,14 +154,14 @@
     // convention.
 
     // Exposed for testing
-    static constexpr size_t MAX_ALGO_LENGTH = 128;
+    static constexpr size_t MAX_KEY_LENGTH = 128;
 
     // Container for the content of an XFRMA_ALG_CRYPT netlink attribute.
     // Exposed for testing
     struct nlattr_algo_crypt {
         nlattr hdr;
         xfrm_algo crypt;
-        uint8_t key[MAX_ALGO_LENGTH];
+        uint8_t key[MAX_KEY_LENGTH];
     };
 
     // Container for the content of an XFRMA_ALG_AUTH_TRUNC netlink attribute.
@@ -169,7 +169,7 @@
     struct nlattr_algo_auth {
         nlattr hdr;
         xfrm_algo_auth auth;
-        uint8_t key[MAX_ALGO_LENGTH];
+        uint8_t key[MAX_KEY_LENGTH];
     };
 
     // Container for the content of an XFRMA_TMPL netlink attribute.
@@ -177,7 +177,7 @@
     struct nlattr_algo_aead {
         nlattr hdr;
         xfrm_algo_aead aead;
-        uint8_t key[MAX_ALGO_LENGTH];
+        uint8_t key[MAX_KEY_LENGTH];
     };
 
     // Exposed for testing