ARM: MediaTek: add basic support for MT8512 boards

This adds a general board file based on MT8512 SoCs from MediaTek.

Apart from the generic parts (cpu) we add some low level init codes
and initialize the early clocks.

This commit is adding the basic boot support for the MT8512 eMMC board.

Signed-off-by: mingming lee <mingming.lee@mediatek.com>
diff --git a/board/mediatek/mt8512/MAINTAINERS b/board/mediatek/mt8512/MAINTAINERS
new file mode 100644
index 0000000..966b1a7
--- /dev/null
+++ b/board/mediatek/mt8512/MAINTAINERS
@@ -0,0 +1,6 @@
+MT8512
+M:	Mingming lee <mingming.lee@mediatek.com>
+S:	Maintained
+F:	board/mediatek/mt8512
+F:	include/configs/mt8512.h
+F:	configs/mt8512_bm1_emmc_defconfig