drivers/cmsis_dap: fix segfault in quirk mode setting

drivers/cmsis_dap: fix segfault in quirk mode setting

CMSIS-DAP quirk mode had to be set after init otherwise
openocd failed due to NULL cmsis_dap_handle

Move quirk_mode from struct cmsis_dap to
a standalone static variable to allow setting from Tcl config
before calling cmsis_dap_open()

Signed-off-by: Tomas Vanek <vanekt@fbl.cz>
Fixes: 7966: drivers/cmsis_dap: use quirk workarounds optionally | https://review.openocd.org/c/openocd/+/7966
Fixes: https://sourceforge.net/p/openocd/tickets/420/
Change-Id: I0b53ec09b35ccf66660e00490f41aaed1bd0f91f
Reviewed-on: https://review.openocd.org/c/openocd/+/8641
Reviewed-by: zapb <dev@zapb.de>
Tested-by: jenkins