feat(mediatek): change log level from INFO to VERBOSE

This change aims to reduce unnecessary information in the default log
output, so change to use VERBOSE.

Change-Id: I80ea57cd4164bdcef915db5392a63ae8982a634f
diff --git a/plat/mediatek/common/mtk_smc_handlers.c b/plat/mediatek/common/mtk_smc_handlers.c
index 5a3ad1f..beb06da 100644
--- a/plat/mediatek/common/mtk_smc_handlers.c
+++ b/plat/mediatek/common/mtk_smc_handlers.c
@@ -99,13 +99,13 @@
 {
 	const struct smc_descriptor *p_smc_desc;
 
-	INFO("print smc descriptor pool\n");
+	VERBOSE("print smc descriptor pool\n");
 	for (p_smc_desc = &pool[0];
 	     (char *)p_smc_desc < (char *)MTK_SMC_POOL_END_UNALIGNED;
 	     p_smc_desc++) {
-		INFO("descriptor name:%s\n", p_smc_desc->smc_name);
-		INFO("descriptor index:%d\n", *p_smc_desc->smc_descriptor_index);
-		INFO("smc id 32:0x%x, smc id 64:0x%x\n",
+		VERBOSE("descriptor name:%s\n", p_smc_desc->smc_name);
+		VERBOSE("descriptor index:%d\n", *p_smc_desc->smc_descriptor_index);
+		VERBOSE("smc id 32:0x%x, smc id 64:0x%x\n",
 		     p_smc_desc->smc_id_aarch32, p_smc_desc->smc_id_aarch64);
 	}
 }