mediatek: mt8192: add uart save and restore api

When system resume, we want to print log as soon as possible.
So we add uart save and restore api, and they will be called
when systtem suspend and resume.

Change-Id: I83b477fd2b39567c9c6b70534ef186993f7053ae
diff --git a/plat/mediatek/mt8192/include/platform_def.h b/plat/mediatek/mt8192/include/platform_def.h
index a3ab1a0..51cf361 100644
--- a/plat/mediatek/mt8192/include/platform_def.h
+++ b/plat/mediatek/mt8192/include/platform_def.h
@@ -26,6 +26,7 @@
 #define MTK_MCDI_SRAM_BASE      0x11B000
 #define MTK_MCDI_SRAM_MAP_SIZE  0x1000
 
+#define INFRACFG_AO_BASE (IO_PHYS + 0x00001000)
 #define GPIO_BASE        (IO_PHYS + 0x00005000)
 #define SPM_BASE         (IO_PHYS + 0x00006000)
 #define PMIC_WRAP_BASE   (IO_PHYS + 0x00026000)