riscv: sifive: initialize PCI on Unmatched

The Unmatched board is typically booted from NVMe which requires PCI.
When dropping to a console PCI is not initialized yet. 'pci enum' has to be
called.

Change the configuration to call  pci_init() in board_init_r().

Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
Reviewed-by: Rick Chen <rick@andestech.com>
diff --git a/configs/sifive_unmatched_defconfig b/configs/sifive_unmatched_defconfig
index ffae865..867611b 100644
--- a/configs/sifive_unmatched_defconfig
+++ b/configs/sifive_unmatched_defconfig
@@ -31,6 +31,7 @@
 CONFIG_DISPLAY_BOARDINFO=y
 CONFIG_DISPLAY_BOARDINFO_LATE=y
 CONFIG_ID_EEPROM=y
+CONFIG_PCI_INIT_R=y
 CONFIG_SPL_MAX_SIZE=0x100000
 CONFIG_SPL_BSS_START_ADDR=0x85000000
 # CONFIG_SPL_SHARES_INIT_SP_ADDR is not set