package/elf2flt: fix fatal error regression on m68k, xtensa, riscv64

This series fixes a fatal error at link time on m68k, xtensa,
and riscv64, caused by a bad upstream elf2flt commit.

Without this patch, m68k, xtensa, and riscv64 would result in
a fatal error:
ERROR: text=0x3bab8 overlaps data=0x33f60 ?

With this patch, qemu_m68k_mcf5208_defconfig,
qemu_riscv64_nommu_virt_defconfig, and
qemu_xtensa_lx60_nommu_defconfig builds properly.

riscv64 and m68k boots to login prompt.
xtensa crashes when loading init, the same behavior as when
reverting the bad upstream elf2flt commit completely.

Signed-off-by: Niklas Cassel <niklas.cassel@wdc.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>