subsys: usb/class/hid: make interrupt endpoint size configurable
subsys: usb/class/hid: make interrupt endpoint size configurable

The Kconfig option HID_INTERRUPT_EP_MPS does not have a prompt entry,
so it is not configurable in practice. Fix that.

Signed-off-by: Aurelien Jarno <bceb368e7f2cb351af47298f32034f0587bbe4a6@aurel32.net>

punitvara/zephyr,galak/zephyr,finikorg/zephyr,finikorg/zephyr,zephyriot/zephyr,nashif/zephyr,galak/zephyr,Vudentz/zephyr,nashif/zephyr,galak/zephyr,zephyrproject-rtos/zephyr,zephyrproject-rtos/zephyr,GiulianoFranchetto/zephyr,ldts/zephyr,zephyriot/zephyr,finikorg/zephyr,kraj/zephyr,zephyrproject-rtos/zephyr,GiulianoFranchetto/zephyr,punitvara/zephyr,kraj/zephyr,ldts/zephyr,nashif/zephyr,Vudentz/zephyr,GiulianoFranchetto/zephyr,punitvara/zephyr,zephyriot/zephyr,ldts/zephyr,Vudentz/zephyr,Vudentz/zephyr,Vudentz/zephyr,galak/zephyr,galak/zephyr,nashif/zephyr,GiulianoFranchetto/zephyr,punitvara/zephyr,kraj/zephyr,explora26/zephyr,explora26/zephyr,explora26/zephyr,zephyrproject-rtos/zephyr,ldts/zephyr,kraj/zephyr,nashif/zephyr,zephyriot/zephyr,ldts/zephyr,finikorg/zephyr,explora26/zephyr,Vudentz/zephyr,kraj/zephyr,GiulianoFranchetto/zephyr,punitvara/zephyr,finikorg/zephyr,explora26/zephyr,zephyriot/zephyr,zephyrproject-rtos/zephyr