device-xiaomi-surya: various updates (MR 4547)

* Depend on the common soc-qcom-sm7150 package
* Set console=null in cmdline
* Add touchscreen firmware to initramfs
* Add required modules for touchscreen to modules-initfs
* Panel output works, drop phoc.ini
* Switch maintainer and co-maintainer
* Bump pkgrel to 1.2

Signed-off-by: Jens Reidel <adrian@travitia.xyz>