sunxi: add LPDDR3 timing from stock boot0

As we added LPDDR3 support in the former patch, we need a set of timing
info to really enable it.

Add the timing info used by stock boot0.

Signed-off-by: Icenowy Zheng <icenowy@aosc.xyz>
Acked-by: Jagan Teki <jagan@amarulasolutions.com>
Tested-by: Jagan Teki <jagan@amarulasolutions.com>
diff --git a/arch/arm/mach-sunxi/Kconfig b/arch/arm/mach-sunxi/Kconfig
index 2761915..bd3e7d3 100644
--- a/arch/arm/mach-sunxi/Kconfig
+++ b/arch/arm/mach-sunxi/Kconfig
@@ -242,6 +242,13 @@
 	This option is the original only supported memory type, which suits
 	many H3/H5/A64 boards available now.
 
+config SUNXI_DRAM_LPDDR3_STOCK
+	bool "LPDDR3 with Allwinner stock configuration"
+	select SUNXI_DRAM_LPDDR3
+	---help---
+	This option is the LPDDR3 timing used by the stock boot0 by
+	Allwinner.
+
 config SUNXI_DRAM_DDR2_V3S
 	bool "DDR2 found in V3s chip"
 	select SUNXI_DRAM_DDR2