Convert CONFIG_PCI_GT64120 to Kconfig

This converts the following to Kconfig:
   CONFIG_PCI_GT64120

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/configs/maltael_defconfig b/configs/maltael_defconfig
index 540864b..963b9be 100644
--- a/configs/maltael_defconfig
+++ b/configs/maltael_defconfig
@@ -39,5 +39,6 @@
 CONFIG_SYS_FLASH_USE_BUFFER_WRITE=y
 CONFIG_SYS_FLASH_CFI=y
 CONFIG_PCNET=y
+CONFIG_PCI_GT64120=y
 CONFIG_RTC_MC146818=y
 CONFIG_SYS_NS16550=y