configs: Re-sync HUSH options

Move all cases of CONFIG_SYS_HUSH_PARSER out of the config.h files.  Remove
all cases of CONFIG_SYS_PROMPT_HUSH_PS2 as everyone uses the default.

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/configs/qemu_mips64el_defconfig b/configs/qemu_mips64el_defconfig
index d8a9c71..a8f1912 100644
--- a/configs/qemu_mips64el_defconfig
+++ b/configs/qemu_mips64el_defconfig
@@ -2,6 +2,7 @@
 CONFIG_TARGET_QEMU_MIPS=y
 CONFIG_SYS_LITTLE_ENDIAN=y
 CONFIG_CPU_MIPS64_R1=y
+CONFIG_HUSH_PARSER=y
 # CONFIG_CMD_LOADB is not set
 # CONFIG_CMD_LOADS is not set
 # CONFIG_CMD_SETEXPR is not set