usb: chipidea: move malloced regmap directly into struct hw_bank

Without this patch a seperate chunk of memory is allocated for the regmap
array. As the regmap is always used it makes no sense to allocate a seperate
memory block for it, this patch moves the regmap array directly into the struct
hw_bank.

Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Signed-off-by: Peter Chen <peter.chen@freescale.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>