linux-motorola-panelli: store full kernel config & fix build

Store the full kernel config instead of a fragment, so
"pmbootstrap kconfig check" can properly verify that all required kernel
options are there. Without this, it would fail an upcoming check for
BINFMT_ELF and BINFMT_SCRIPT:
https://lists.sr.ht/~postmarketos/pmbootstrap-devel/patches/38508

With the full config, pmbootstrap found that ANDROID_PARANOID_NETWORK
was enabled while it should be disabled, so disable it.

Fix the mediatek drvgen related build failure with
00_disable_drvgen.patch from linux-wiko-ufeel and including cust.dtsi:
https://wiki.postmarketos.org/wiki/Porting_to_a_new_device#Removing_python2_dependency