arm: baltos: remove custom linker script

commit 3d74a09 ("ti: am335x: Remove unused linker script") removed
the linker script for the TI variant. This linker script doesn't seem to
do anything special and on top of that, has no definitions for the EFI
runtime sections.

So let's get rid of it and use the generic linker script which defines
those correctly

Signed-off-by: Ilias Apalodimas <[email protected]>
Reviewed-by: Tom Rini <[email protected]>