usb: provide different USB product strings in the USB samples
usb: provide different USB product strings in the USB samples

Make it possible to change USB manufacturer, product and
serial number strings by forcing prompt in the kconfig files.

Signed-off-by: Iván Sánchez Ortega <a15f8b81a160b4eebe5c84e9e3b65c87b9b2f18e@sanchezortega.es>

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