cmd: move down CONFIG_CMD_BOOTEFI after CONFIG_BOOTM_VXWORKS

Due to the commit 4b0bcfa7 ("Kconfig: Migrate CONFIG_BOOTM_* options")
BOOTEFI and BOOTEFI_HELLO_COMPILE (and other BOOTEFI configs) are
displayed in a long distance. This will make it difficult for us to
understand that those configurations are closely related.

Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org>
Reviewed-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Reviewed-by: Tom Rini <trini@konsulko.com>