x86: remove obsolete option PROT_MODE_SWITCH

Zephyr requires that the processor be in 32 bit protected mode on
entry.

Change-Id: I71792eeb154281881e8516a7a8a2291a52f83fc6
Signed-off-by: Dirk Brandewie <dirk.j.brandewie@intel.com>
2 files changed