iface: remove generic T: [u8] in functions

[thvdveld]

Removing the generic reduces the code size and I don't think we actually need it in the interface.

[thvdveld]

With generics:

   Compiling smoltcp v0.10.0 (/home/thvdveld/source/vub/smoltcp)
    Finished release [optimized + debuginfo] target(s) in 3.56s
   text	  data	   bss	   dec	   hex	filename
1490502	 84032	   536	1575070	18089e	server

Without generics:

   Compiling smoltcp v0.10.0 (/home/thvdveld/source/vub/smoltcp)
    Finished release [optimized + debuginfo] target(s) in 9.13s
   text	  data	   bss	   dec	   hex	filename
1480146	 83072	   536	1563754	17dc6a	server

[codecov]

Codecov Report

Merging #810 (ad3f387) into main (a684195) will not change coverage.
The diff coverage is 85.00%.

@@           Coverage Diff           @@
##             main     #810   +/-   ##
=======================================
  Coverage   79.65%   79.65%           
=======================================
  Files          72       72           
  Lines       27862    27862           
=======================================
  Hits        22193    22193           
  Misses       5669     5669           

Impacted Files	Coverage Δ
src/iface/interface/mod.rs	49.62% <50.00%> (ø)
src/iface/interface/ethernet.rs	91.48% <100.00%> (ø)
src/iface/interface/ieee802154.rs	88.75% <100.00%> (ø)
src/iface/interface/ipv4.rs	68.50% <100.00%> (ø)
src/iface/interface/ipv6.rs	91.38% <100.00%> (ø)
src/iface/interface/sixlowpan.rs	74.93% <100.00%> (ø)

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[Dirbaio]

woah, 10kb less??

[thvdveld]

Looks like it, yes!