Convert CONFIG_SYS_PCI_64BIT to Kconfig

This converts the following to Kconfig:
   CONFIG_SYS_PCI_64BIT

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/configs/MPC837XERDB_defconfig b/configs/MPC837XERDB_defconfig
index 16d4251..192bcae 100644
--- a/configs/MPC837XERDB_defconfig
+++ b/configs/MPC837XERDB_defconfig
@@ -5,6 +5,7 @@
 CONFIG_ENV_SECT_SIZE=0x10000
 CONFIG_DEFAULT_DEVICE_TREE="mpc8379erdb"
 CONFIG_SYS_CLK_FREQ=66666667
+# CONFIG_SYS_PCI_64BIT is not set
 CONFIG_MPC83xx=y
 CONFIG_HIGH_BATS=y
 CONFIG_TARGET_MPC837XERDB=y
diff --git a/configs/durian_defconfig b/configs/durian_defconfig
index 158fec2..b44fd90 100644
--- a/configs/durian_defconfig
+++ b/configs/durian_defconfig
@@ -7,6 +7,7 @@
 CONFIG_ENV_SIZE=0x1000
 CONFIG_DEFAULT_DEVICE_TREE="phytium-durian"
 # CONFIG_PSCI_RESET is not set
+CONFIG_SYS_PCI_64BIT=y
 CONFIG_AHCI=y
 CONFIG_DISTRO_DEFAULTS=y
 CONFIG_SYS_LOAD_ADDR=0x90000000
diff --git a/configs/sifive_unmatched_defconfig b/configs/sifive_unmatched_defconfig
index dddc25c..cbada15 100644
--- a/configs/sifive_unmatched_defconfig
+++ b/configs/sifive_unmatched_defconfig
@@ -10,6 +10,7 @@
 CONFIG_SPL=y
 CONFIG_SPL_SPI_FLASH_SUPPORT=y
 CONFIG_SPL_SPI=y
+CONFIG_SYS_PCI_64BIT=y
 CONFIG_AHCI=y
 CONFIG_TARGET_SIFIVE_UNMATCHED=y
 CONFIG_ARCH_RV64I=y
diff --git a/configs/socrates_defconfig b/configs/socrates_defconfig
index f2e9271..ea0224d 100644
--- a/configs/socrates_defconfig
+++ b/configs/socrates_defconfig
@@ -3,6 +3,7 @@
 CONFIG_ENV_SIZE=0x4000
 CONFIG_ENV_SECT_SIZE=0x20000
 CONFIG_DEFAULT_DEVICE_TREE="socrates"
+# CONFIG_SYS_PCI_64BIT is not set
 CONFIG_MPC85xx=y
 # CONFIG_CMD_ERRATA is not set
 CONFIG_TARGET_SOCRATES=y