feat(mediatek): move mtk_cirq.c drivers to cirq folder

To use cirq drivers more easier, we place mtk_cirq.c and mtk_cirq.h
to common/drivers/cirq.

We also rename mtk_cirq.c/h to mt_cirq.c/h for consistency with other
driver folders.

TEST=build pass for mt8192/mt8195/mt8186
BUG=b:236331724

Change-Id: I71bc442f00b16fb4031260937982c0496fcaaea0
diff --git a/plat/mediatek/mt8188/platform.mk b/plat/mediatek/mt8188/platform.mk
index 82c4ce1..83a5b95 100644
--- a/plat/mediatek/mt8188/platform.mk
+++ b/plat/mediatek/mt8188/platform.mk
@@ -22,6 +22,7 @@
 MODULES-y += $(MTK_PLAT)/common
 MODULES-y += $(MTK_PLAT)/lib/mtk_init
 MODULES-y += $(MTK_PLAT)/lib/pm
+MODULES-y += $(MTK_PLAT)/drivers/cirq
 MODULES-y += $(MTK_PLAT)/drivers/gic600
 MODULES-y += $(MTK_PLAT)/drivers/timer