Cross Reference: /device/google/contexthub/util/nanoapp_sign

`Name`	`Date`	`Size`
Up to higher level directory
`Android.bp`	22-Oct-2020	`931`
`Makefile`	22-Oct-2020	`978`
`nanoapp_sign.c`	22-Oct-2020	`18.2K`
`test_exponent`	22-Oct-2020	`860`
`test_modulus`	22-Oct-2020	`860`