powerpc/akebono: Fix unmet dependency errors

The AKEBONO config has various selects under it, including some with
user-selectable dependencies, which means those dependencies can be
disabled. This leads to warnings from Kconfig.

This can be seen with eg:

  $ make allnoconfig
  $ ./scripts/config --file build~/.config -k -e CONFIG_44x -k -e CONFIG_PPC_47x -e CONFIG_AKEBONO
  $ make olddefconfig

  WARNING: unmet direct dependencies detected for ATA
    Depends on [n]: HAS_IOMEM [=y] && BLOCK [=n]
    Selected by [y]:
    - AKEBONO [=y] && PPC_47x [=y]

  WARNING: unmet direct dependencies detected for NETDEVICES
    Depends on [n]: NET [=n]
    Selected by [y]:
    - AKEBONO [=y] && PPC_47x [=y]

  WARNING: unmet direct dependencies detected for ETHERNET
    Depends on [n]: NETDEVICES [=y] && NET [=n]
    Selected by [y]:
    - AKEBONO [=y] && PPC_47x [=y]

  WARNING: unmet direct dependencies detected for MMC_SDHCI
    Depends on [n]: MMC [=n] && HAS_DMA [=y]
    Selected by [y]:
    - AKEBONO [=y] && PPC_47x [=y]

  WARNING: unmet direct dependencies detected for MMC_SDHCI_PLTFM
    Depends on [n]: MMC [=n] && MMC_SDHCI [=y]
    Selected by [y]:
    - AKEBONO [=y] && PPC_47x [=y]

The problem is that AKEBONO is using select to enable things that are
not true dependencies, but rather things you probably want enabled in
an AKEBONO kernel. That is what a defconfig is for.

So drop those selects and instead move those symbols into the
defconfig. This fixes all the kconfig warnings, and the result of make
44x/akebono_defconfig is the same before and after the patch.
Reported-by: Yury Norov <yury.norov@gmail.com>
Reported-by: Randy Dunlap <rdunlap@infradead.org>
Reported-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Tested-by: Randy Dunlap <rdunlap@infradead.org>
Reviewed-by: Randy Dunlap <rdunlap@infradead.org>
Acked-by: Florian Fainelli <f.fainelli@gmail.com>
Link: https://lore.kernel.org/r/20210201012503.940145-1-mpe@ellerman.id.au

arch/powerpc/configs/44x/akebono_defconfig

@@ -21,6 +21,7 @@ CONFIG_IRQ_ALL_CPUS=y
 # CONFIG_COMPACTION is not set
 # CONFIG_SUSPEND is not set
 CONFIG_NET=y
+CONFIG_NETDEVICES=y
 CONFIG_PACKET=y
 CONFIG_UNIX=y
 CONFIG_INET=y
@@ -41,7 +42,9 @@ CONFIG_BLK_DEV_RAM_SIZE=35000
 # CONFIG_SCSI_PROC_FS is not set
 CONFIG_BLK_DEV_SD=y
 # CONFIG_SCSI_LOWLEVEL is not set
+CONFIG_ATA=y
 # CONFIG_SATA_PMP is not set
+CONFIG_SATA_AHCI_PLATFORM=y
 # CONFIG_ATA_SFF is not set
 # CONFIG_NET_VENDOR_3COM is not set
 # CONFIG_NET_VENDOR_ADAPTEC is not set
@@ -98,6 +101,8 @@ CONFIG_USB_OHCI_HCD=y
 # CONFIG_USB_OHCI_HCD_PCI is not set
 CONFIG_USB_STORAGE=y
 CONFIG_MMC=y
+CONFIG_MMC_SDHCI=y
+CONFIG_MMC_SDHCI_PLTFM=y
 CONFIG_RTC_CLASS=y
 CONFIG_RTC_DRV_M41T80=y
 CONFIG_EXT2_FS=y

arch/powerpc/platforms/44x/Kconfig

@@ -206,17 +206,10 @@ config AKEBONO
 	select PPC4xx_HSTA_MSI
 	select I2C
 	select I2C_IBM_IIC
-	select NETDEVICES
-	select ETHERNET
-	select NET_VENDOR_IBM
 	select IBM_EMAC_EMAC4 if IBM_EMAC
 	select USB if USB_SUPPORT
 	select USB_OHCI_HCD_PLATFORM if USB_OHCI_HCD
 	select USB_EHCI_HCD_PLATFORM if USB_EHCI_HCD
-	select MMC_SDHCI
-	select MMC_SDHCI_PLTFM
-	select ATA
-	select SATA_AHCI_PLATFORM
 	help
 	  This option enables support for the IBM Akebono (476gtr) evaluation board