ARM: DRA7: hwmod: fix gpmc hwmod

GPMC smart idle is not really broken but it does not support
smart idle with wakeup.

Fixes: 556708fe ("ARM: OMAP: DRA7: hwmod: Make gpmc software supervised as the smart idle is broken")

Signed-off-by: Roger Quadros <rogerq@ti.com>
Reviewed-by: Paul Walmsley <paul@pwsan.com>
Signed-off-by: Paul Walmsley <paul@pwsan.com>