Starqltechn fixes and improvements

starqltechn: deviceinfo: enable flash on update

Device uses heimdall flash method by default, with uppercase partition name in it's PIT file. This conflicts with flash on update, because in Linux partitions named in lowercase. To resolve this conflict, default flash method changed to fastboot. Heimdall still can be used with --method flag: pmbootstrap flasher --method heimdall-bootimg flash_kernel

• enable flash on update flag.
• change default flash method to 'fastboot'

starqltechn: u-boot: add bootscript to prebootscript

U-boot doesn't output bootscript logs, which makes it hard to debug.

Put bootscript to prebootscript section. Preboot is executed before boot, and u-boot displays it's logs.

starqltechn: u-boot: fix FIT image

• increase memory for bootm command to 0x5000000
• change initramfs and fdt loading addresses to leave more space for kernel decompression and loading

starqltechn: u-boot: fix kernel command line

• Enable console to workaround a race condition with display initialisation (https://gitlab.freedesktop.org/drm/msm/-/issues/46)
• Remove unneeded options from kernel command line