rockchip: rk3288: vyasa: Drop ROCKCHIP_BROM_HELPER selection

ROCKCHIP_BROM_HELPER is selected as if TPL/SPL ROCKCHIP_BACK_TO_BROM
has been defined, so drop the explicit enablement for vyasa board.

This change is supposed to missed during config move to
other locations, and missed to drop the same.

Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
Reviewed-by: Kever <Yang&lt;kever.yang@rock-chips.com>

arch/arm/mach-rockchip/rk3288/Kconfig

@@ -104,7 +104,6 @@ config TARGET_POPMETAL_RK3288
 config TARGET_VYASA_RK3288
 	bool "Vyasa-RK3288"
 	select BOARD_LATE_INIT
-	select ROCKCHIP_BROM_HELPER
 	select TPL
 	help
 	  Vyasa is a RK3288-based development board with 2 USB ports,