Ensure EFI bootloader gets placed onto filesystem

[kallisti5]

The bios_ia32 bootloader gets placed at /boot/system/haiku_loader.bios_ia32. However, the EFI bootloader doesn't make it into the haiku_loader package. (thus isn't updatable post-install)

The way our boot process is designed, the bios_ia32 loader has to be the "first" file within the haiku_loader hpkg... however the EFI bootloader could be added afterwards.

I remember doing this in the past, but it was reverted because the bios_ia32 wasn't guarenteed to be first with our current tooling causing inconsistent booting issues.

tldr; we need to ensure all bootloaders for a platform get into haiku_loader... and the bios_ia32 is always the "first entry" in the package as a special one-off. (or we need to create multiple haiku_loader packages and adjust our MBR code to search for the haiku_loader_bios_ia32 one)