arm64: defconfig: Fix unintentional disablement of PCI on i.MX

A recent update to support PCI endpoint mode on i.MX platforms
unintentionally disabled PCI host support for i.MX in defconfig.  The
existing PCI_IMX6 was made a hidden option, selected by new options
PCI_IMX6_HOST (for the existing support) and PCI_IMX6_EP (for the
endpoint mode), but there has been no corresponding update to defconfig
so the PCI_IMX6 ends up getting disabled.  Switch defconfig to
PCI_IMX6_HOST to preserve the existing functionality.

Fixes: 75c2f26d ("PCI: imx6: Add i.MX PCIe EP mode support")
Reported-by: "kernelci.org bot" <bot@kernelci.org>
Signed-off-by: Mark Brown <broonie@kernel.org>
Reviewed-by: Richard Zhu <hongxing.zhu@nxp.com>
Link: https://lore.kernel.org/r/20230220-imx-pci-defconfig-v1-1-2210cf08340e@kernel.org


Signed-off-by: Arnd Bergmann <arnd@arndb.de>