configs: Re-sync almost all of cmd/Kconfig

This syncs up the current cmd/Kconfig and include/configs/ files with the
only exception being CMD_NAND.  Due to how we have used this historically
we need to take further care here when converting.

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/configs/qemu_mips64el_defconfig b/configs/qemu_mips64el_defconfig
index a8f1912..9eb93ef 100644
--- a/configs/qemu_mips64el_defconfig
+++ b/configs/qemu_mips64el_defconfig
@@ -3,8 +3,11 @@
 CONFIG_SYS_LITTLE_ENDIAN=y
 CONFIG_CPU_MIPS64_R1=y
 CONFIG_HUSH_PARSER=y
+CONFIG_SYS_PROMPT="qemu-mips64el # "
 # CONFIG_CMD_LOADB is not set
 # CONFIG_CMD_LOADS is not set
 # CONFIG_CMD_SETEXPR is not set
+CONFIG_CMD_RARP=y
+CONFIG_CMD_DHCP=y
 CONFIG_SYS_NS16550=y
 CONFIG_USE_PRIVATE_LIBGCC=y