kgdboc: disable the console lock when in kgdb
After commit ddde3c18 ("vt: More locking checks") kdb / kgdb has become useless because my console is filled with spews of: WARNING: CPU: 0 PID: 0 at .../drivers/tty/vt/vt.c:3846 con_is_visible+0x50/0x74 CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.3.0-rc1+ #48 Hardware name: Rockchip (Device Tree) Backtrace: [<c020ce9c>] (dump_backtrace) from [<c020d188>] (show_stack+0x20/0x24) [<c020d168>] (show_stack) from [<c0a8fc14>] (dump_stack+0xb0/0xd0) [<c0a8fb64>] (dump_stack) from [<c0232c58>] (__warn+0xec/0x11c) [<c0232b6c>] (__warn) from [<c0232dc4>] (warn_slowpath_null+0x4c/0x58) [<c0232d78>] (warn_slowpath_null) from [<c06338a0>] (con_is_visible+0x50/0x74) [<c0633850>] (con_is_visible) from [<c0634078>] (con_scroll+0x108/0x1ac) [<c0633f70>] (con_scroll) from [<c0634160>] (lf+0x44/0x88) [<c063411c>] (lf) from [<c06363ec>] (vt_console_print+0x1a4/0x2bc) [<c0636248>] (vt_console_print) from [<c02f628c>] (vkdb_printf+0x420/0x8a4) [<c02f5e6c>] (vkdb_printf) from ...
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609488bc
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