dt-bindings: Remove Netlogic bindings

Support for Netlogic was removed in commit 95b8a5e ("MIPS: Remove
NETLOGIC support"). Remove the now unused bindings.

The GPIO binding also includes "brcm,vulcan-gpio", but it appears to be
unused as well as Broadcom Vulkan became Cavium ThunderX2 which is ACPI
based.

Cc: Linus Walleij <[email protected]>
Cc: Bartosz Golaszewski <[email protected]>
Cc: George Cherian <[email protected]>
Cc: Mark Brown <[email protected]>
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Signed-off-by: Rob Herring <[email protected]>
Acked-by: Mark Brown <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

Author: robherring