core: LTC use only _CFG_CORE_LTC_ variables

LTC is only taking _CFG_CORE_LTC_ prefixed variables into account for
configuration.

_CFG_CORE_LTC_ prefixed variables are assigned based on CFG_CRYPTO_ and
other variables for unchanged LTC configuration.

Reviewed-by: Jerome Forissier <jerome.forissier@linaro.org>
Signed-off-by: Jens Wiklander <jens.wiklander@linaro.org>
[jf: pick commit a1cbb72 ("core: LTC use only _CFG_CORE_LTC_ variables")]
[jf: keep LTC changes only]
Signed-off-by: Jerome Forissier <jerome.forissier@linaro.org>

core/lib/libtomcrypt/src/encauth/gcm/gcm_mult_h_arm_ce.c

@@ -35,7 +35,7 @@ void gcm_mult_h(gcm_state *gcm, unsigned char *I)
 	dg[0] = get_be64(I + 8);
 
 	tomcrypt_arm_neon_enable(&state);
-#ifdef CFG_HWSUPP_PMULL
+#ifdef _CFG_CORE_LTC_HWSUPP_PMULL
 	pmull_ghash_update_p64(1, dg, zeroes, k, NULL);
 #else
 	pmull_ghash_update_p8(1, dg, zeroes, k, NULL);