device-samsung-gtaxlwifi: remove obsolete and invalid properties

While I haven't verified it personally, the wiki entry for this device
states that neither Weston nor Plasma Mobile work on the device,
indicating that DRM probably doesn't actually work. Furthermore, it is a
downstream port, so it working would be a miracle regardless. As for the
keyboard property, it is obsolete.

Part-of: <https://gitlab.postmarketos.org/postmarketOS/pmaports/-/merge_requests/7243>

device/downstream/device-samsung-gtaxlwifi/APKBUILD

@@ -1,7 +1,7 @@
 # Reference: <https://postmarketos.org/devicepkg>
 pkgname=device-samsung-gtaxlwifi
 pkgdesc="Samsung Galaxy Tab A 2016 (SM-T580)"
-pkgver=3
+pkgver=4
 pkgrel=0
 url="https://postmarketos.org"
 license="MIT"
@@ -26,5 +26,5 @@ package() {
 }
 
 sha512sums="
-6105bb2e7540e41331e58be044feeff308239c8caa13b3874f5dc790b4c7ede51cef3005bcf49690528e272b6274d0cf8d742b3f1ae4ccdd6aa8ffa7f0b2b98f  deviceinfo
+2f50b9a12979d41dc77ae31ab433ca9421e29f1af807d27dc624dfd2d14dd57af671fda633af258ff0ac3de26516ffa89b3c914a3f25c5ac4e73ecdfed6dece1  deviceinfo
 "

device/downstream/device-samsung-gtaxlwifi/deviceinfo

@@ -11,11 +11,9 @@ deviceinfo_arch="aarch64"
 
 # Device related
 deviceinfo_chassis="tablet"
-deviceinfo_keyboard="false"
 deviceinfo_external_storage="true"
 deviceinfo_screen_width="1200"
 deviceinfo_screen_height="1920"
-deviceinfo_gpu_accelerated="true"
 
 # Bootloader related
 deviceinfo_flash_method="heimdall-bootimg"