Revert "C# bindings: Add support for creating USB contexts"
Revert "C# bindings: Add support for creating USB contexts"

This reverts commit 9aa1d4d5b0fd384d1bc7fd31ace57e65a02c8781.

Signed-off-by: Paul Cercueil <73d292422978d45c9eeef455bb1b24a0db453722@analog.com>

analogdevicesinc/libiio,analogdevicesinc/libiio,analogdevicesinc/libiio,analogdevicesinc/libiio