Turning 'def_bool' in Kconfig.defconfig files into 'default' revealed
three unused symbols (confirmed with 'git grep'). Remove them.
Search for "Kconfig.defconfig" in
https://docs.zephyrproject.org/latest/application/kconfig-tips.html for
an explanation of how def_bool->default can reveal undefined symbols.
Removed unused symbols:
- SPI_DW_CLOCK_GATE
- PINMUX_MPS2
- BOARD_XTENSA
Also remove an assignment to the promptless symbol ALTERA_AVALON_SYSID,
in tests/boards/altera_max10/sysid/prj.conf. Assignments to promptless
symbols have no effect.
Signed-off-by: Ulf Magnusson <Ulf.Magnusson@nordicsemi.no>
Ulf Magnusson