Revert "cxl: Add cxl_check_and_switch_mode() API to switch bi-modal cards"

Remove abandonned capi support for the Mellanox CX4.

This reverts commit b0b5e591.

Signed-off-by: Alastair D'Silva <alastair@d-silva.org>
Acked-by: Andrew Donnellan <andrew.donnellan@au1.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>