userland_generic.ld: Include .sdata in the data section
userland_generic.ld: Include .sdata in the data section

If an ELF has a .sdata section it won't be copied to the TBF file. To
ensure that it makes it in let's include it in the data section.

Signed-off-by: Alistair Francis <52ecf00b70a50079ae8d5fa09b9af6904950b63c@wdc.com>

tock/libtock-c,tock/libtock-c,tock/libtock-c