This adds support for the basic timer counter (TC) found on SAM0
series parts. This driver only supports running the counter
in 32 bit wide mode. Since this mode explicitly slaves the odd
counters to the even ones, only instances of the even ones are
defined.
Tested with tests/drivers/counter/counter_basic_api on SAMD21.
Signed-off-by: Derek Hageman <hageman@inthat.cloud>
SAMD20 does not have the DMA or USB peripherals and as a result
the IRQs for all subsequent lines are shifted down from SAMD21.
This splits the interrupt assignment for the SERCOMs into the
SoC specific DTS file and moves the USB definition to SAMD21 only.
Signed-off-by: Derek Hageman <hageman@inthat.cloud>
Derek Hageman