core: add BITCOIN_ONLY to mock file

core/embed/extmod/modtrezorutils/modtrezorutils.c

@@ -114,6 +114,7 @@ STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(mod_trezorutils_halt_obj, 0, 1,
 /// VERSION_PATCH: int
 /// MODEL: str
 /// EMULATOR: bool
+/// BITCOIN_ONLY: bool
 
 STATIC const mp_rom_map_elem_t mp_module_trezorutils_globals_table[] = {
     {MP_ROM_QSTR(MP_QSTR___name__), MP_ROM_QSTR(MP_QSTR_trezorutils)},

core/mocks/generated/trezorutils.pyi

@@ -33,3 +33,4 @@ VERSION_MINOR: int
 VERSION_PATCH: int
 MODEL: str
 EMULATOR: bool
+BITCOIN_ONLY: bool

core/src/trezor/utils.py

@@ -1,6 +1,6 @@
 import gc
 import sys
-from trezorutils import (  # type: ignore[attr-defined] # noqa: F401
+from trezorutils import (  # noqa: F401
     BITCOIN_ONLY,
     EMULATOR,
     GITREV,