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/malta64_defconfig b/configs/malta64_defconfig
index cbea4fa..a2d938c 100644
--- a/configs/malta64_defconfig
+++ b/configs/malta64_defconfig
@@ -38,5 +38,6 @@
 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