BaseTools:Change the case rules for ECC check pointer names

BZ:https://bugzilla.tianocore.org/show_bug.cgi?id=2087

In CryptHkdf.c  line 42

  EVP_PKEY_CTX *pHkdfCtx;

Variable pHkdfCtx begins with lower case 'p',
which should be acceptable because it it is a pointer.
(Refer to CCS_2_1_Draft, 4.3.3.3)

So ECC tool should be improved to handle issues like this.

Cc: Liming Gao <liming.gao@intel.com>
Cc: Bob Feng <bob.c.feng@intel.com>
Reviewed-by: Bob Feng <bob.c.feng@intel.com>
Signed-off-by: Zhiju.Fan <zhijux.fan@intel.com>