huawei-y635: new device

Another MSM8916 device, yay (＾▽＾)

The devices original firmware can't boot aarch64 kernels, luckily Huawei forgot to setup secure boot so we use diffrent firmware that supports 64-bit with a bootloader that's bundled into qhypstub. I've described the processes of doing so on it's device page: https://wiki.postmarketos.org/wiki/Huawei_Y635_(huawei-y635)

Source for WCNSS_qcom_wlan_nv.bin: https://github.com/Huawei-Y635-Dev/android_device_huawei_hwY635/blob/cm-14.1/wifi/WCNSS_qcom_wlan_nv.bin

rootston.ini is for Phosh, without it Phosh will scale too big and will only display a part of it on the screen.

For pointercal (Source: https://gitlab.com/postmarketOS/pmaports/-/merge_requests/2287):

Screen dimension 480x854
Touchscreen dimension (reported by evtest) 2047x2047
  480/2047*65535 = ~15367
  854/2047*65535 = ~27341

• https://gitlab.com/postmarketOS/pmaports/-/merge_requests/3014