mediatek: mt7622: clean up image build
* clean up whitespace to make GPT partitioning more readable
* don't select packages already part of the target default selection
* don't select U-Boot variants (breaks ImageBuilder)
* don't select AHCI on boards without SATA
* don't select kmod-usb2 and kmod-ohci, USB 1.x and USB 2.0 devices
work fine with the in-SoC XHCI host having just kmod-usb3 installed.
* select kmod-btmtkuart for devices with Bluetooth support
* sort DEVICE_PACKAGES
Signed-off-by: Daniel Golle <daniel@makrotopia.org>