feat(rtl8139): Use MMIO instead of port IO

This lets the driver be used on all architectures, not just x86_64.

While at it, drop the udelay requirement, it boils down to a spin loop
and we already have a spin loop here.

Signed-off-by: Jens Reidel <[email protected]>

Author: Gelbpunkt

Cargo.lock

@@ -64,7 +64,7 @@ mmap = ["mman"] # Deprecated in favor of mman
 newlib = []
 nostd = []
 pci = ["virtio?/pci"]
-rtl8139 = ["net", "pci"]
+rtl8139 = ["net", "pci", "volatile/derive", "endian-num"]
 semihosting = ["dep:semihosting"]
 shell = ["simple-shell"]
 smp = []
@@ -121,6 +121,7 @@ build-time = "0.1.3"
 cfg-if = "1"
 crossbeam-utils = { version = "0.8", default-features = false }
 embedded-io = { version = "0.7", features = ["alloc"] }
+endian-num = { version = "0.2", optional = true, features = ["linux-types"] }
 enum_dispatch = "0.3"
 fdt = { version = "0.1", features = ["pretty-printing"] }
 free-list = "0.3"