x86: nvme: coreboot: Enable NVMe

Enable support for NVMe storage devices. Update the driver to enable the
bus master bit, since coreboot does not do that automatically.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
diff --git a/configs/coreboot_defconfig b/configs/coreboot_defconfig
index 3030e5b..f6ffb51 100644
--- a/configs/coreboot_defconfig
+++ b/configs/coreboot_defconfig
@@ -59,6 +59,7 @@
 CONFIG_ATAPI=y
 CONFIG_LBA48=y
 CONFIG_SYS_64BIT_LBA=y
+CONFIG_NVME_PCI=y
 # CONFIG_PCI_PNP is not set
 CONFIG_SOUND=y
 CONFIG_SOUND_I8254=y