sunxi: Kconfig: introduce SUNXI_MINIMUM_DRAM_MB

Traditionally we assumed that every Allwinner board would come with at
least 256 MB of DRAM, and set our DRAM layout accordingly. This affected
both the default load addresses, but also U-Boot's own address
expectations (like being loaded at 160 MB).

Some SoCs come with co-packaged DRAM, but only provide 32 or 64MB. So
far we special-cased those *chips*, as there was only one chip per DRAM
size. However new chips force us to take a more general approach.

Introduce a Kconfig symbol, which provides the minimum DRAM size of the
board. If nothing else is specified, we use 256 MB, and default to
smaller values for those co-packaged SoCs.
Then select the different DRAM maps according to this new symbol, so
that different SoCs with the same DRAM size can share those definitions.

Inspired by an idea from Icenowy.

This is just refactoring: compiled for all boards before and after this
patch: the binaries were identical.

Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Reviewed-by: Jernej Skrabec <jernej.skrabec@gmail.com>

boot/Kconfig

@@ -499,8 +499,8 @@ config SYS_TEXT_BASE
 	default 0x80800000 if ARCH_OMAP2PLUS || ARCH_K3
 	default 0x81700000 if MACH_SUNIV
 	default 0x2a000000 if MACH_SUN9I
-	default 0x42e00000 if MACH_SUN8I_V3S
-	default 0x4a000000 if ARCH_SUNXI
+	default 0x4a000000 if SUNXI_MINIMUM_DRAM_MB >= 256
+	default 0x42e00000 if SUNXI_MINIMUM_DRAM_MB >= 64
 	hex "Text Base"
 	help
 	  The address in memory that U-Boot will be running from, initially.