sunxi: Move common defconfig options to Kconfig

Some config symbols are found in *almost* every _defconfig file for
Allwinner boards, because those options are actually a platform choice,
and not a per-board decision.
Some of these options are older, some have recently been added.

Move those options to be set for all Allwinner boards in their
respective Kconfig files.

The rationales are as follows:
- NR_DRAM_BANKS: All Allwinner SoC map DRAM at one contiguous region of
  address space only, starting at 1 GB. So it's always one bank.
- SPL_{DOS,EFI}_PARTITION: The Allwinner SPL does only support raw MMC
  accesses, we don't care about filesystems or partitions in there, so
  there is no need to define those symbols at all.
- USE_PREBOOT: We start USB early when a keyboard is configured, using the
  preboot env variable, so we need to set this variable.
- SYS_RELOC_GD_ENV_ADDR: We don't specify any ENV_ADDR, so need this
  symbol to be set (according to 8d8ee47e03).
- SYS_USB_EVENT_POLL_VIA_INT_QUEUE: According to commit eab9433aa5,
  specifying this reduces the latency of the USB keyboard handling, so
  this was formerly enabled in config headers for all Allwinner boards.

Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Acked-by: Maxime Ripard <mripard@kernel.org>
Tested-by: Jagan Teki <jagan@amarulasolutions.com> # Amarula A64-Relic
Reviewed-by: Jagan Teki <jagan@amarulasolutions.com>

Kconfig

@@ -115,6 +115,7 @@ config ENV_VARS_UBOOT_CONFIG
 
 config NR_DRAM_BANKS
 	int "Number of DRAM banks"
+	default 1 if ARCH_SUNXI
 	default 4
 	help
 	  This defines the number of DRAM banks.

arch/arm/Kconfig

@@ -989,6 +989,8 @@ config ARCH_SUNXI
 	select USB_KEYBOARD if DISTRO_DEFAULTS
 	select USB_STORAGE if DISTRO_DEFAULTS
 	select SPL_USE_TINY_PRINTF
+	select USE_PREBOOT
+	select SYS_RELOC_GD_ENV_ADDR
 	imply CMD_DM
 	imply CMD_GPT
 	imply CMD_UBI if MTD_RAW_NAND

disk/Kconfig

@@ -46,6 +46,7 @@ config DOS_PARTITION
 config SPL_DOS_PARTITION
 	bool "Enable MS Dos partition table for SPL"
 	depends on SPL && PARTITIONS
+	default n if ARCH_SUNXI
 	default y if DOS_PARTITION
 
 config ISO_PARTITION
@@ -112,6 +113,7 @@ config EFI_PARTITION_ENTRIES_OFF
 config SPL_EFI_PARTITION
 	bool "Enable EFI GPT partition table for SPL"
 	depends on  SPL && PARTITIONS
+	default n if ARCH_SUNXI
 	default y if EFI_PARTITION
 
 config PARTITION_UUIDS

drivers/usb/Kconfig

@@ -108,6 +108,7 @@ config USB_KEYBOARD_FN_KEYS
 
 choice
 	prompt "USB keyboard polling"
+	default SYS_USB_EVENT_POLL_VIA_INT_QUEUE if ARCH_SUNXI
 	default SYS_USB_EVENT_POLL
 	---help---
 	  Enable a polling mechanism for USB keyboard.