nvme: Split out PCI support

Apple SoCs have an integrated NVMe controller that isn't connected
over a PCIe bus. In preparation for adding support for this NVMe
controller, split out the PCI support into its own file. This file
is selected through a new CONFIG_NVME_PCI Kconfig option, so do
a wholesale replacement of CONFIG_NVME with CONFIG_NVME_PCI.

Signed-off-by: Mark Kettenis <kettenis@openbsd.org>
Reviewed-by: Simon Glass <sjg@chromium.org>
Tested on: Macbook Air M1
Tested-by: Simon Glass <sjg@chromium.org>
diff --git a/configs/khadas-vim3l_android_ab_defconfig b/configs/khadas-vim3l_android_ab_defconfig
index 4d22db2..b2bdf96 100644
--- a/configs/khadas-vim3l_android_ab_defconfig
+++ b/configs/khadas-vim3l_android_ab_defconfig
@@ -62,7 +62,7 @@
 CONFIG_DM_MDIO_MUX=y
 CONFIG_ETH_DESIGNWARE_MESON8B=y
 CONFIG_MDIO_MUX_MESON_G12A=y
-CONFIG_NVME=y
+CONFIG_NVME_PCI=y
 CONFIG_PCI=y
 CONFIG_PCIE_DW_MESON=y
 CONFIG_MESON_G12A_USB_PHY=y