device-kobo-clara2e: board revision autodetection and prepare for FDE

Everything is there, just use the autodetection, FDE was seen working
with revision b.

Part-of: <https://gitlab.postmarketos.org/postmarketOS/pmaports/-/merge_requests/7984>

device/testing/device-kobo-clara2e/APKBUILD

@@ -2,7 +2,7 @@
 maintainer="Andreas Kemnade <andreas@kemnade.info>"
 pkgname=device-kobo-clara2e
 pkgdesc="Kobo Clara 2E"
-pkgver=4
+pkgver=5
 pkgrel=0
 url="https://postmarketos.org"
 license="MIT"
@@ -35,7 +35,7 @@ package() {
 }
 
 sha512sums="
-889a39dabaeb4d19456b4cd0c8b435ec7ee51be465b09407b9f2faf4c31928fb9bb942f7bc8181c2c8f182ee092512689431c7495e2b08318220321a69a716dd  deviceinfo
+4ec1f1f21a10b8dd02df1506d866fdcbcffb85e825065d4ec43a614730c3e8de823c2771a469aa2940f31c1495a6544fbcd5ac0d14c667a4f4b7589aefb9028e  deviceinfo
 b4ab1b5ce58c0c46e655cfe898ff28897abae0e0ba2d927613f7ce2b21fb3fdb3ffaa8b5b260daa9baebef49f71e3c068932fe255ffa420d6ecc9c9e99c67aca  kernel-cmdline.conf
-90da9f4f7833af6286c7dad81c5601bb2e35f814f501d02d9e37a80f35c453ae8b8a5c49ed36fcb5b35eef1d81280679a82ef80a60b4bca373a33b0b8f881511  modules-initfs
+431a126cc1d544e04d1b548bef55d2c1b470e622bdf8313e368e8413d77c30e316c2d8265a0ccb141db2f18ba6aa0c732dd215df82a1254993e0bca498980b04  modules-initfs
 "

device/testing/device-kobo-clara2e/deviceinfo

@@ -8,7 +8,7 @@ deviceinfo_manufacturer="Kobo"
 deviceinfo_codename="kobo-clara2e"
 deviceinfo_year="2022"
 deviceinfo_arch="armv7"
-deviceinfo_dtb="imx6sll-kobo-clara2e-a"
+deviceinfo_dtb="imx6sll-kobo-clara2e-a imx6sll-kobo-clara2e-b"
 deviceinfo_generate_extlinux_config="true"
 
 # Device related

device/testing/device-kobo-clara2e/modules-initfs

@@ -1 +1,3 @@
 mxc_epdc_drm
+fp9931
+edt_ft5x06