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/am437x_gp_evm_defconfig b/configs/am437x_gp_evm_defconfig
index 69f5ac7..742e148 100644
--- a/configs/am437x_gp_evm_defconfig
+++ b/configs/am437x_gp_evm_defconfig
@@ -7,6 +7,7 @@
 CONFIG_SPL=y
 CONFIG_SPL_STACK_R=y
 CONFIG_SYS_EXTRA_OPTIONS="CONS_INDEX=1"
+CONFIG_HUSH_PARSER=y
 # CONFIG_CMD_IMLS is not set
 # CONFIG_CMD_FLASH is not set
 CONFIG_CMD_GPIO=y